Something I experienced in D&D games where the players had access to spells of higher potency than the usual low level adventuring fare was that our understanding of defenses comes from a non-magical world, and as such, most locales are woefully underprepared for magical assault and infiltration.
This can work in settings that are generally low magic, where hostile wizards and monsters are freak accidents akin to a natural disaster. But in the highly fantastical worlds most games take place in, one has to wonder why the world is not ruled by sorcerers by now, and then further ask why countermeasures against said sorcerers have not been developed.
The answer D&D mostly came to seems to have been a 'magical arms race.' There are scrying spells, so there are anti-scrying spells. Personally I do not much care for this- it smacks of childhood playground roleplay where one insouciant youth declares they have a force field, another declares they have a force field breaker, the first responds they have a force field breaker proof force field, and so on until the recess bell sounds. Looking at the statblocks of high level characters, it also leads to a sort of tiresome 'checklist' of necessary defenses against increasingly esoteric means of attack- anyone who's anyone has to have freedom of movement and contingency spells and a ring of spell turning and I'm not here for it.
But what of the common humanoid, who does not have access to so much as a 1st level Magic-User, who nonetheless wishes to defend themselves against vicious wizards? These are the concerns and defenses and protocols that should be as commonsense as locks and walls in a world with magic, though not all locations would have the funding for all of these countermeasures.
THREATS AND POTENTIAL COUNTERMEASURES
In general- casting spells is VERY illegal outside of trusted individuals performing societally-approved functions.
Are you casting Cure Light Wounds on the wounded mayor, or Charm Person? Comprehend Languages to understand the foreign king, or Fireball to assassinate him? Throwing rocks, knives, ale goblets, and so on to disrupt anyone mumbling gibberish to disrupt potential curses would save many a village from wicked sorcerers, wall guards are probably allowed to shoot first and ask questions later if they see some gesticulating occultist, and anyone attempting to cast a spell unprompted in the presence of someone with enough authority to have bodyguards should expect to be clubbed and tackled, bound and gagged at best, and shot dead by arrows, javelins, shuriken, etc at worst.
Sanctioned wizardry would come from court-sorcerers who must go through a lengthy training and background-check process, battlemages who are part of an established military, and magically-engaged tradesfolk whose services are well known and have established trust, like appraisers, translators, educators at a wizard college, alchemists, etc etc. In few circumstances would foreigners, strangers, or vagabond adventurers be allowed to cast magic willy nilly. Wishing to practice sorcery would likely require applying for a permit of sorts, and any actual spellcasting would be overseen by two squads of burly fellows with instructions to bash the wizards brains out if anything untoward occurs- one squad being immediately present, the other waiting some distance away. There would likely be an alarm system for 'magic threat' in the form of drums, horns or bells, with codes to provide basic information throughout a fortress quickly, allowing word of shapeshifters, mind influencers, fliers, invisible foes, etc to be warned against.
This immediately makes it clear why wizards may wish to build their towers and dungeons far from society- it is the only way they can practice their craft in peace. Of course, going 'rogue' makes one an appealing target to other 'rogue' wizards, so defenses against spells are necessary be they a dungeon or a lord's castle.
Charm Person
Perhaps the most problematic spell for security, the simplest solution is probably to have all employees act in groups of two or more, without exception.Very high security positions would also likely quarantine any new hires for at least a month to allow any arcane influence to wear off. There would also be established protocols to enact if you believed someone was under bewitchment, the rigor and effectiveness varying greatly by circumstance. 'Charm checks' would likely be de-escalatory and delaying in nature rather than going straight to tackling and binding people acting suspicious- an invitation to sit down and talk and explain what they're doing, possibly calling in more people to judge, all the while searching for lurking sorcerers.
Guard dogs may also serve as security against this specific spell to some degree, both for places and peoples, and other types of guardian beasts provide even better insurance, though at some point the logistics of exotic and monstrous guardians may outweigh the benefits.
In terms of information security, this spell is a disaster, but it could be mitigated somewhat by keeping much information on a 'need to know' basis, and instilling values of secrecy where you do not tell details of an operation to anyone- not friends, not family, certainly not minions.
Depending on where the spell's description is from, "Protection From Evil" may prevent or suppress charm effects. If so, any churches should be able to schedule 'charm checks' within a 24 hour period. Though this is part of the 'magical arms race' I mentioned, such check-ups should be common in populated areas with organized religion as any cleric could pull it off.
Sleep
While groups of 2+ work well against Charm Person, to have good odds of at least one individual not falling asleep, the group must be of 4+ size, and to prevent those who resist from being taken out by opposing forces before they can wake their fellows, sizes of 12+ are likely required, which quickly requires unmanageable masses of personnel. The best solution is likely to have small squads of guards on mobile patrols and frequent check-ins rather than long, static positions. That way, if one person evades sleep, they can sound an alarm horn and expect hasty reinforcements, and if a small group of 2-3 is taken out, their absence will quickly be noticed. Passwords would help prevent the issue of Slept targets having their gear stripped and used as a disguise, though none of these are sleep-specific countermeasures so much as general security against guards being taken out.
But that's for a fortress with funding and troops- is there no way for, say, a small shop owner to prevent being robbed by a sleep-casting thief? One method to counter sleep would be an unpopular one- clothing or armor could be crafted such that, upon slumping or otherwise falling prone, a nail would stab the so afflicted, waking them. This method would be used only by those with serious personal investment or professionalism rather than the average hired guard, as those unwilling to risk accidental wounding would likely modify the clothing to reposition the digging nails, but circumstance where attack by enemy wizards could be expected (in a war zone, for instance) this sort of gear might be worn in appropriate circumstances of sentry duty (nail-suits being unsuited for actual fighting).
Magic Missile
Though not all too different from a crossbow in many circumstances, this spell would be of considerable concern for assassinating troop commanders and other VIPS through normal methods of defense like armor, horseback, heavy cover, etc. While it has a magical countermeasure in Shield, the mundane countermeasure would be decoys, bodyguards who are also body doubles, equipped in similar gear. Ornate masks and full helms that declare ones identity would be popular for this reason, and if lined with lead, this works well against ESP as well.
Light/Darkness
Though the short duration of these spells makes them not too concerning save for, perhaps, causing a focus on training to fight and operate blind from mage-hunters and elite forces, the Continual Light would change campaign settings considerably. Temples would likely be illuminated by continual light, as would the homes of kings and the like, and perhaps even the streets of cities or popular roads. Continual Light lanterns(or glowing swords) would almost certainly exist in abundance, as someone knowing the spell has little reason not to create at least one daily. Rather than a defensive concern, this is an infiltration concern, as there may be no way to approach a locale under cover of night or shadow if there are arbitrary amounts of 'Continual lights' keeping the grounds forever well-lit.
ESP
Infosec's worst nightmare, this spell actually has a mundane countermeasure in that a 'thin sheet of lead' will block it (and other scrying spells). As such, any structure with secrets should have lead embedded in thinner walls, and individuals such as guards, clerks, and so on who may have handy information should be clad in lead-mesh cowls/hats or lead-lined helmets. If operating costs are an issue, simply keeping things secret from ones own organization lowers the chance that an ESP-caster will gain access to someone with sensitive information. All manner of espionage tradecraft from real life will also be useful here- dead drops, coded messages, false information, agent handling, etc etc. Some of my players came up with the idea of using ignorant messengers to relay information they did not know of to break up ESP security and play double agent during a civil war.
One might be tempted to remove ESP from a game due to its ability to flatline an investigation, but having it available does allow one to sidestep boundary-transgressing torture/interrogation scenes that commonly may occur in groups. Also, it may keep nobles and other authority figures from becoming corrupt, or, in the event of corruption, they may disallow evidence obtained in that way from counting as proof, so the effects on a game are far from society-shattering, even if players may lean on it as a handy crutch.
Knock
A fairly comprehensive spell of opening, it has one notable weakness in that it will not open portculli. As such, having small but heavy interior portculli suddenly is not merely bizarre dungeon whimsy, but a legitimate defense against certain spells... though a rather expensive one, and one that can be foiled by Charming the portcullis operators. I wonder if dungeon portculli were introduced after knock as a knock-proof obstacle...
The existence of Knock also may explain secret passages somewhat- while a secret door may spring wide from a knock, an open passage behind a piano or whatever remains concealed.
Spider Climb/Levitate/Flight
While largely not too different from the fear of climbers, this allows for access to basically any window, so height and difficulty of scaling a climb alone cannot be considered proper deterrents. Windows should be either arrowslits, or of metal bars to disallow entry or exit without relying on locks, on account of knock. Curtains or wooden shutters can block line of sight as well. Caltrop-like spikes, grease, or other hazards could line certain areas as well to discourage landing and setting forth a rope line to bring others up, and blind spots with regards to the sky and rooftops should be avoided. If nothing else, 'sky watchers' with bells to alert a stronghold of aerial infiltration should be employed in positions that more standard guards might find tiresome- a 'crow's nest' could be cheaply constructed, or belltowers, watchtowers, etc could serve this purpose.
A common concern is also the issue of locating invisible fliers, but apart from perhaps lighting fires and firing at disturbances in smoke, or perhaps keen-eared and nosed hounds put on sky watcher duty, I think it easier to prevent these fliers access rather than hope to deny them all nearby airspace, and hope they do not have bombing capabilities of breaching a location.
Locate Object
As mentioned in ESP, interior walls where secrets are to be kept should be lead-lined, and the same applies to keeping objects of value safe in lead-lined chests and coffers. Coffins may be commonly lead-lined as well.
Invisibility
Closed doors, doors that have bells to ring when opened, and guards trained to look for footprints, throw dirt or liquids, swing spears or ropes in wide arcs, and the ever-useful keen-eared and nosed guard dog will do much to limit the use of Invisibility. However, it becomes complicated when combined with other spells, especially those which allow the spellcaster to avoid contact with the ground like Spider Climb, Levitate, Flight, Silence etc. This allows casters to get close and perhaps get a spell off without interference. Exploiting the wizards self-preservation instincts with the threat of being caught in anti-aerial crossfire is hopefully deterrent force enough if the presence of sky-watching archers is obvious.
Clairaudience/Clairvoyance/Wizard Eye
A difficult spell to counter, as lead sheets do not block it, the best mundane methods I can think of would be to conduct sensitive meetings in secret code or obscure language, as well as to keep records written in ciphers, and of course, to change and update these codes and languages with enough frequency so that if the code is broken, the vulnerability will be temporary. Changing meeting locations would also help dodge such scrying attempts.
Speak with Animals
A rare but easily overlooked vulnerability could be the guard dogs, farm animals, and local wildlife around a location. The best defense is probably treating those animals very well, but this may not always be possible- for example, spikes on roofs and windowsills would upset birds, but may help keep away fouler fliers. Removing animals entirely may be possible depending on location, though this will in turn likely upset wild animals at being denied an environment and make them more likely to help intruders who encounter them nearby.
Fireball/Lightning Bolt/Arson
Soggy mats of vegetable matter or hides are sometimes draped over wooden walls to prevent arson via flaming arrows and the like, but this is not always feasible. Pots/Sacks/Buckets of sand and earth could be kept around to help extinguish fires before they get out of hand (and can help find Invisible targets in a pinch). Of course, the main defense is not using wood as a structural material, relying on stone instead, though this is a much higher cost of construction.
While less structurally menacing than Fireball, Lightning Bolt can smash through weak walls and devastate hallway defenses. Tricking a wizard into shooting a stone wall through a well-placed tapestry might kill them with a reflected bolt, but shortening lines of fire will also reduce the efficiency of ranged weapons. Having twisting corridors may be beneficial if guards are primarily melee combatants, though this defensive measure makes infiltration easier without clear lines of sight.
Protection from Normal Missiles-
Missile weapons are one of the best ways to interrupt wizard nonsense, so this spell is very relevant for siege-wizards. At close distances it could be foiled by molotovs, as it is the ensuing pool of flame that causes damage, not the thrown flask of oil or alcohol, but at longer distances, without magic, only siege weapons can pierce this defense. Providing such engines with anti-personnel shot like baskets of spiked balls may allow for more accurate blasting of wizards, though this is more of a measure to add to pre-existing siege engines, not a reason to buy them as a specific counter.
This spell may not work against specific projectiles depending on GM interpretation-odd ranged attacks like nets or bolas, boomerangs or blowpipes, or perhaps firearms, or attacks made such that gravity propels them like dropped rocks, may be able to bypass it.
Water Breathing
Castles with streams, local wells, etc etc should have grates that allow water through, but little else, and moats or other watery barriers should not be written off as inaccessible means of approach. Honestly, this is less for the concern of water-logged wizard infiltrators and more for various amphibious horrors.
Speak With Dead/Animate Dead-
These two spells turn the dead into potential liabilities, and as such, crypts to inter those knowledgeable about secrets should be a must-have over common graveyards. They must be securely guarded, perhaps by portcullis, certainly by lead-lined coffin, and perhaps by keeping those coffins held shut by nails, welding, etc. Corpses could also be staked down, mouths filled with lead, and other means of preventing speech or reanimation.
Polymorph-
As troubling as a perfect disguise might be, introducing code phrases would help shut this down, as well as help confirm anyone turned into a newt is who they say they are. The usual protocol of everyone always has someone with them would help reduce the chances of a single polymorph being sufficient Keeping cats and chickens about to menace any rat/insect-polymorphs for infiltration could help, though that then requires the cats and chickens to be marked somehow to prove they are local and not infiltrators themselves.
Dimension Door/Teleportation-
Though blindly teleporting in is too risky for most wizards, with some scrying or prior infiltration, they might be willing to try it. Having 'decoy' rooms (and ideally body doubles acting as decoy people to add a sense of liveliness to those locations) and guards ready for exotic modes of infiltration is the best mundane countermeasure I could think of.
On a side note, the safest method for an AD&D teleport pad would be a platform suspended about 30' above a pool of water, so 'low' mishaps teleport the person into water or free-falling into it, rather than into the earth.
Cloudkill/Gas- Though rather specific, ventilation shafts both for lighter-than air and heavier-than air gases could be placed in key locations. to help disperse such gases rather than let them collect within the halls. This does well to prevent problems with smoke as well, which is a mundane enough concern to merit inclusion anyway.
Passwall-
Walls that are a prime target for being passwalled, Dig'd, or sundered by various magics may do well to in fact be TWO walls, with a hollow space between them, ideally with a moat or spiked pit. While expensive and pointless against scaling or flying, on exterior walls this is a fairly effective countermeasure for subterranean complexes.
Illusions (Thanks to DymeNovelti of the discord for this update)
For the most part, illusions function as a distraction to humans rather than a unique problem like Knock, and have a lot of variance of being 'hologram' or 'delusion' based on GM handling. I think for the most part, illusions would be handled much like any other distraction- trigger happy sling stones, investigating only in groups of 2+, and not clumping everyone up to investigate and sticking to chain of command, but still challenging illusory kings for passcodes, etc etc. I think generally speaking 'high alert' caused by illusory fires or dragons would still be met with 'standard' responses of locking down portculli, keeping people in their assigned squads and battle stations, and the like.
Dogs would be handy against certain illusions that lack full-sensory output (such as Phantasmal Force) and could be relied on against certain illusory tricks, and can sniff out illusionists regardless of what the illusion is, so whenever there's trickery afoot, there's sure to be a dog-team deployed to look for a mage sooner or later.
EXAMPLE SECURE LOCATION
I hope to use this map as a training grounds in one-shots to refine these ideas, and would welcome feedback for general countermeasures and specific ones so that future locations may have tighter security. Ways to reduce the number of staff, portculli, and general cost of operations would be useful too so as to scale things down to smaller operations. This isn't quite a full module, so certain NPCs and logistics may need to be improvised, but the goal is not to be a place impervious to guile or force- just one that will not roll over and die to wizardly action.
Missions
1- Assassination/Abduction- Take out the master of the castle
2- Rescue- Recover a prisoner or corpse.
3- Information- Learn of secret plans from encoded correspondance or a meeting with a visiting noble
4- Sabotage- disable defenses, allowing incoming army to take it over with ease
5- Compromise-Get an imposter, charmed, bribed, blackmailed, etc agent on the inside of the keep and a way to leak info
6- Theft- Steal an item of note, a confiscated artifact or legendary grave good.
Castle Gant Gard
A border castle of the north end of Queen's Coast, this place must be vigilant against infiltration by agents of King's Point, and frequently holds sensitive information, VIPs, and meetings of the lords of the warfront.
The "Forester Mounds" refer to semi-permanent dwellings of civilians who have served as archers and have taken this position out of patriotism, and often a lack of other good living opportunities. While the lack of prestige might breed resentment in 'real' guards, foresters are strictly separate from castle affairs and so are in little position to affect anything if compromised. They are not allowed within the castle, except in event of a siege, and are expected to keep their distance from castle staff. They are barred from bearing arms within sight of castle-dwellers, and failing to do so may bring great suspicion or even arrows down upon them. This is to prevent assassins from replacing foresters. They are allowed to hunt men and beasts that come within 3 miles of the castle who are not on the Gant Road, shooting first and questioning later, leaving captured or dead foes at the castle gate for review by the castle. They are expected to keep at least one dog to help sniff for sneaking or invisible agents, and as they are responsible for feeding themselves, they are frequent fishermen, so as to keep an eye on the river/canal. The foresters are expected to meet daily with each other so imposters or missing peoples may not go unnoticed for long, and report inconsistencies at the castle gate, speaking through the portcullis, but have no strict organization, being a very passive and nebulous first line of defense.
General-
Most rooms have a large pot full of dirt to help extinguish fires, or throw to help reveal invisible infiltrators. Overzealous dirt-throwing is kept in check by the requirement that whoever threw dirt sweeps it up and returns it to the pot.
There are no windows or chimneys large enough to allow human passage, but any external room does have some to allow for ventilation and light.
Roofs of towers and the keep are steep and lines with caltrop-like spikes around the edges, making climbing or landing precarious and risky.
Passwords are required to have a house guard allow wallguards access to the keep, as it is strictly off-limits otherwise. Said passwords change every week, and are not known to the wall guards or other staff, only by the garrison commander and the house guards of the keep.
The grounds and halls are kept well-lit by candle-lanterns, and are somewhat crowded, making it difficult to be alone and not within sight or earshot of someone else. Privacy is very low, and it is protocol to take at least one extra person with you at all times. Typically, ones chosen partner is also a good friend, and training exercises encourage partnering up to foster these duos.
Alarms go from whistles, which are for internal communication between foresters, wallguards, or house guards. To Horns, which are for communication with everyone on active duty and have codes for things like fire, invisible, fliers, climbers, shapeshifters, etc etc that squad commanders at least must have memorized. Finally, there are the Bells of the keep, which are used to rouse not just those on duty, but everyone, and have similar warning codes to horns but indicate a problem that even the serving staff and lord must be made aware of immediately. Bell alarms wake sleepers, and may wake those magically Slept as well, depending on GM ruling.
Any guard higher ranking than the rank and file will have a lead lined helmet and a horn.
Guard equipment includes a lantern and oil to light arrows with, a sling to hurl rocks if ammo is to be conserved, a bow or crossbow, and spears and shortswords. They are typically armored with chain mail, or unarmored if they are on arrow-slit firing/watching duty.
House guards (the guards of the Keep) wear Nail-Suits that deal 1d4 damage to them if they become prone (such as by being Slept) and count as leather armor. They also wear lead-lined helmets, have password knowledge, generally do not carry ranged weapons, and are high-morale elites unfazed by blindfighting, grappling, or other unusual circumstances, chosen for loyalty. Any bribe they are offered will be matched by the lord of the castle.
Keep servants are usually not true civilians, but experienced military camp followers who were recommended to the position after proving themselves to a knight or other high-ranking member of the keep occupants. All recruitment requires a quarantine period and background check that takes close to a month to ensure they are not compromised nor an imposter.
The master of the castle, when in public, wears a lead-lined mask and helm, as do their two bodyguards/body doubles. They are with the master at all times, and may even pose as the master to attempt to draw out schemes. There are two more, to take care of alternating day/night shifts, and they add to confusion by using the masters quarters as their own, doing paperwork, resting in the royal bed, and so on just as the master might, to bamboozle scriers and spiers.
The castle moat (a canal dug to divert the river it is near) is not that deep, and is surrounded by damp wooden spikes bound together, cheval de friese. This is largely an anti-siege measure, but for infiltrators, anything attempting to reach the castle wall will be delayed and likely noisy thanks to splashing, and zealous and bored wall-guards alike will fire bolts at basically any noted disturbance. At night they use fire-arrows to help illuminate the surroundings, animals being good sport or food. If a dog has an official collar, it may avoid being fired on, but animals(and their trainers) that run loose are not viewed with goodwill here.
The Drawbridge is controlled from the gatehouse, which also has a portcullis. Though the drawbridge is usually down, the portcullis is usually closed.
The Walls have overhanging machicolations to make climbing more difficult and are 2 stories tall, and are patrolled by 2-man teams of crossbowmen (or slingers in rain) who travel from tower to tower until their shift is over and they return to tower-duty. Their main task is to blow an alarm whistle if they spot a threat or anything anomalous to bring the larger squads inside the guard towers to attention. Whistles between the guards are common and do not cause larger alarm or reprimand for overuse save for in the most gratuitous instances.
The Watchtowers, A-F, 3 stories tall
are primarily for sieges, allowing for crossfire upon enemy troops and are manned with swiveling ballista with a variety of shot, both anti-infantry, anti-air (chains or multiple smaller bolts in a bundle), and dirt-loaded sacks that are used for practice shots and for catching invisible foes in clouds of dust. They have small squads of men on each floor, including squad leaders- the top floor being the ballista crew and external lookouts, equipped with horns to blow alarms for various situations to bring the castle to alert status and alert other guard towers. The second floor, on the level of the walltops, has guards who watch the walltop patrols and the castle interior grounds, peering through door slots and arrow slits with crossbows at the ready in case of internal problems. Finally the ground floor has the keymaster for each tower, and resting guards who are only semi-on duty, armed with melee weapons and only called upon to respond to active threats.
Gatehouse C has no ground floor or entry for security reasons.
Gatehouse E has a door leading to the wall that runs to the Keep, but the Keep-side door is a small portcullis operated from inside the keep and is rarely used due to the annoyance of requiring a password and cooperation of the internal house-guards.
E's ground door entry is near the kennels, not in the inner courtyard.
The Gatehouse- A special watchtower with an added murder-hole and portcullis operations, and no ground level (the ground level being the space between the portcullis and the standard large gates.) Portcullis lifting requires several people to operate, as the winch-wheel is quite hefty. The doors to the gatehouse, on the walltops, are kept locked and guards on wallpatrol knock and ask for a 'all is well' password when encountering it on their trip around the walls.
Like Gatehouse E, there is a wall that leads to a tower of the Keep that is locked by a portcullis and barely if ever actually used in day to day life due to the required security measures, being primarily a way for the gatehouse guards to fall back to the keep in the event of the outer wall being breached.
Entry Booth- Inside the walled entry courtyard, this building is only manned when the portcullis is up by guards looking for imposters, infiltrators, etc. They make a record of all who enter or leave the castle, demand weapons be turned over (to be returned later), note declared cargo, beasts of burden, etc etc. They will always have guard dogs.
Inner CourtyardTwo more portculli and walls prevent access to the rest of the grounds around the keep. These portculli are not open even when the outer door is, opening to allow access to the keep and grounds only once the Entry Booth guards declare visitors cleared for entry.
Kennels- Where the castle dogs are kept by the Master of Hounds. Castle dogs have spiked collars with identifying marks and most squads of guards will have a dog whose main purpose is to sense hidden foes, but is trained to sic people as well. Dogs are only fed at the kennels, to prevent them from being fed poisoned food or distracted while on-duty.
Smith
The blacksmithy for upkeep of arms and armors. Invariably busy. Well away from other wooden structures to avoid spreading fire, as are most structures. There are multiple smiths of varying quality ensuring the place is always active to keep up with demand.
Barracks A and B- These 1-story wooden buildings are the quarters for the wallguards, who are the most numerous of troops for this place. The Garrison Commander has a special office in Barracks B where paperwork is handled. They are for the most part always semi-occupied by off-duty guards sleeping or relaxing, and there are usually guard dogs as well, either leashed to a post near the door or inside with their trainer.
Training Grounds
Where troops and knights drill riding, dog training, archery, and sparring, even at night, to keep eyes and boots always active around the keep.
THE KEEP
The keep has its own portcullis that comes down in front of its standard double door entrance, as it is a secondary fallback zone for the troops if the outer wall falls. Though closed at night, it is usually open during the day to save time.
Waiting Room/Checkpoints
The entry hall, mostly a place for guards to operate the portcullis mechanism, looks left and right down halls that lead to guard-manned checkpoints. Unlike other internal keep guards, these guards are armed with crossbows so as to catch intruders in crossfire. Similarly to the external checkpoint booth, the guards here take note of all who enter or leave the keep, and there are even more internal portculli that bar entrance to deeper into the keep past these checkpoints. While one portculli, typically the left one may be left open to speed things along (like when servants are loading up supplies), it is protocol to never have both open at once, and they are opened not from the checkpoint side, but from the hallway beyond, so that in the event the internal guards are taken out the keep may be locked down from within, and crossbow bolts fired from down the hall at anyone or anything attempting to force its way through the second portcullis line of defense.
Tower/Stairs
The northmost tower bottoms have stairs leading to the second level and little else.
House Kennel
There are dogs and cats kept inside the keep to hunt rats and other pests, and the kennels are located where they are to deter sneaky entrance through the left portcullis, sleep near their master's beds to raise the alarm if something untoward occurs, and so on. They are smaller animals than the large guard-dogs of the wallguard, though there are accommodations for larger beasts if required. House animals are closer to being pets and have collars and bells making their presence and identity easily known, and though these animals may go outside, outside animals are not allowed inside the keep.
Great Hall- a throne room/feasting hall/dance hall for general assembly of the house guard and guests, and where the castle master takes public audience. There are three thrones, occupied by the liege and their bodyguards/body doubles, and guards will typically be in attendance as well, standing to the sides of the room to keep an eye out for any would be sorcerers, assassins, etc.
The support wall behind the throne is actually two walls, with sand filling the gap between them, just as a possible preventative measure against a Passwall assassin.
Kitchen- Though the Great Hall also has a fireplace to roast things in, the kitchen is a crowded space full of servants, who frequently enter and exit. As an unspoken rule, it is expected that servers taste the food as they bring it out as a guard against poison, (and a chef who isn't tasting food constantly is a poor one) and failure to do so is seen not as a sign of potential poisoning typically, but of a possible imposter, to which a challenge of the weekly password may be posed as proof of identity.
Storage/Descent
A storeroom and cellar, frequently used as passage by servants. If the master of the castle is in his throne room, the door is usually guarded or locked, much to the dismay of the kitchen staff who must go the long way for ingredients so as to avoid bothering the master.
It also has the staircase to the lower levels.
Lounge/Stairs Up
A well-appointed and high-traffic room with stairs up to a landing, then to the second level.
Chapel
Somewhat isolated from the hustle and bustle, this is a chapel to Our Lady of Gardens, though a somewhat dingy one with no external window, reliant on candlelight. It is a common place for people acting suspiciously to be brought, and while this place is meant to focus on mundane countermeasures, if there is clerical assistance to be had, it will be had here.
Low Status Guest Quarters
A communal sleeping space, the barracks for the wall guard if they must retreat to the keep during a siege gone wrong. Also serves for the retinue of visiting nobles. It will be guarded at night on both doors, with anyone wishing to leave escorted by additional guards called in from the nearby right checkpoint, to ensure guests may not wander freely. As usual, guards operate in pairs.
Privys
Tunnels let waste go into the moat, and are blocked by metal grates. Occasional blockages require the appointment of a very small person to wriggle through the tunnel to clear the blocked grate, and nothing larger than a cat should be able to enter or exit the castle this way. Often clogged in winter due to freezing, leading chamberpots clumsily thrown out the arrow-slits to be the preferred method of disposing of waste.
KEEP, SECOND STORY
Guard Towers- Guards keep an eye on the wallguards and grounds from here. The towers with portculli leading to the walls are kept closed to the outside unless a password is spoken (and of course, the speaker is identified as someone to let inside) and there is a secondary interior portculli that requires further cooperation of someone from within the keep (typically guards from the top-right tower) allowing entrance. There are far fewer interior guards on the keep towers than on the walls, and they are more concerned with security than serving as archery-turrets.
There are stairs leading to the roof here, but the trapdoors are locked, and barred from opening due to the placement of stones that prevent them from opening from outside. Daily "Roof Duty" is undertaken by four house guards who must call the password to be allowed entry, even if they have rung alarm bells that indicate their peril. This 'third level' is wall-less save for defensive ramparts but not roofless, and has a hanging alarm bell and vision to the other bell-towers, save diagonally, for the steepled roof blocks vision.
The top towers have at times been used for nesting birds or messenger bats, though this is a potential security issue.
Guard Barracks
Near the noble quarters for quick assistance if an alarm is sounded. Though they sleep in shifts, these barracks are guarded as well, by human and dog.
Servant Quarters- Unguarded, but often active with servant swapping shifts, with the top left guard tower guards able to keep an eye on this hallway in case something untoward occurs. Thin walls and arrowslit windows allow one to hear shouting from the lower left guard station, an awkward and slow way for the wallguard to request access to the keep if that tower is unmanned.
Armory
Guard equipment and masses of arrows, used to supply the house guard and equip troops that fall back to the keep in time of peril. Typically locked, requiring a key from the keep commander, so that those without weapons cannot gain access (though the doors are between two guard towers and behind portculli so it is difficult even ignoring the lock.)
Storage
Domestic storage for servant winter clothing, bedding, candles, stepladders, buckets, mops, etc. Frequently accessed by servants and guards alike for odds and ends.
Noble Chambers
Grand bed, closet,etc etc. Everything a noble needs to be ostentatious.
Noble Chambers (decoy)Identical to the Noble Chambers, occupied sometimes by the master of the castle and sometimes by bodydoubles.
Noble Chambers (alternate)
Not identical, but equally well-appointed, and has a door to the bath-house allowing for more privacy than tramping in a bathrobe through the halls to the other chambers does.
Also has a secret passage behind the curtains of the four poster bed that allows for swift exit that will hopefully be mistaken for exit into the bath-house.
Panic Room/Secret Study
A portcullis can be lowered with the pull of a lever, but is kept open unless someone is inside. The walls are lined with lead, foiling some forms of detection. Sensitive items and information are kept here, and it is sometimes used as a meeting room by people who already know of its existence (past masters of the castle, royal agents, or body doubles.) It contains rations and weapons in addition to any secret information.
BASEMENT/SUBLEVEL
Dungeon Entry Guard Station
Manned by guards who are on long shifts, but have frequent checkups from servants/other guards due to the convenient location of being between two storage rooms.Their main duty is to restrict access to prisoners and the crypts, typically opening only to identified people like the master of the castle, garrison commander, or other people of note. They are equipped with crossbows and burning oil to menace anything coming up the hallway through the portcullis. They tend to have an older guard dog.
Lower Storage Room
The lower-food storage where root vegetables, wine, cheeses, etc are kept. Dungeon guards tend to gain weight and nibble on foods here out of boredom, which is overlooked as long as consumption is not egregious- a reward of being posted to dungeon duty. Dungeon guards and kitchen staff tend to be on a first-name basis with each other.
Solitary Cells
For important and public prisoners, or just quarantine for people who are suspected to be compromised, plagued, etc. Locked iron doors with more privacy than an iron bar door.
Prison Cell-
Single large room behind locked iron bar doors for containment of masses of prisoners of war and the like.
Secret Meeting Room (Alternate)
A dingy dungeon meeting room where clandestine meetings spoken in alternate languages or code may be held so as not to give away the location of the panic room.
Has a secret door (a brick-lined iron door that opens when a torch sconce is pulled) behind which is a locked iron bar jail-cell style door behind which a lead-lined oubliette where secret prisoners may be held is hidden.
Secret Meeting Room (Decoy)
A very obviously fake wall slides open to this room filled with compelling but obsolete or useless junk- a desk with a map, pyrite and glass treasures, code scrolls no one uses anymore, etc etc. A pressure plate will close the wall behind anyone entering, and it does not open from the inside, trapping snoopers. Occasionally used as a meeting room to bait suspected agents and spies whose presence is suspected but not identified.
Crypt
Old coffins line the walls, covering up older alcoves where the dead lie, with the central support pillar full of alcoves for corpses and their grave-goods. The hallway to the crypt is strewn with tripwires that ring small bells to alert the guards the dead walk if there are no prisoners to howl in terror at such an occurrence.
Behind one such coffin is an empty alcove that can be crawled through to reach the secret crypt.
Secret Crypt
The walls and the stone sarcophagi alike are lead-lined. Corpses of spymasters and others with sensitive information lay here and have their mouths bound shut with lead to prevent necromancers from forcing them to speak, and their stone coffins are nailed shut to further deny access to the dead and any sensitive grave goods they may be buried with.
