D12 Dungeon Surveilance & Security

Add one of these to a dungeon to beef up the risks and inhabitant readiness.
If you use my dungeon DEFCON posts these will increase the wandering monster chances and defences faster

Also See:
Forest Spirits

https://elfmaidsandoctopi.blogspot.com/2020/07/d100-petty-wilderness-spirits.html
Regular Fantasy Hauntings
https://elfmaidsandoctopi.blogspot.com/2017/04/petty-hauntings-and-faking-stories.html
WW1 Trench Hauntings
https://elfmaidsandoctopi.blogspot.com/2015/09/d100-petty-ghosts-and-hauntings.html
Poltergiest
https://elfmaidsandoctopi.blogspot.com/2025/01/d100-poltergiests.html
Dungeon Spirit Tricks
https://elfmaidsandoctopi.blogspot.com/2022/09/d100-dirty-tricks-of-dungeon-gods.html
Dungeon Phantasms
https://elfmaidsandoctopi.blogspot.com/2018/05/d100-dungeon-illusions-and-phantasms.html
Dungeon Spirits
https://elfmaidsandoctopi.blogspot.com/2018/09/dungeon-spirits.html
https://elfmaidsandoctopi.blogspot.com/2018/05/d100-dungeon-spirits.html
Dungeon Repairs
https://elfmaidsandoctopi.blogspot.com/2018/06/dungeon-repairs.html
Wrath of the Dungeon Animus 
https://elfmaidsandoctopi.blogspot.com/2018/05/the-redbrick-dungeon-is-mad-at-you-now.html
Idols
https://elfmaidsandoctopi.blogspot.com/2017/12/d100-weird-dungeon-idols.html
Drrams
https://elfmaidsandoctopi.blogspot.com/2020/01/creepy-dungeon-dreams.html
Imp Offers
https://elfmaidsandoctopi.blogspot.com/2020/11/d100-treats-offered-by-imps-from-hell.html

Search engines on blogger and google for my work is getting worse - i can ask for a post by name and it looks and stops and presents me with its selections. Dungeon Spirits posts were unfindable on google.

D12 Dungeon Surveillance

1 Vermin - The dungeon boss uses vermin like rats, bats, toads or flies via magic, domestication, lycanthropy or an allied dungeon spirit. Often uses vents and drains to spy and carry alerts

2 Guard Beasts - species of creature tribe kept as alarms or guards. May be subtle, like a species of bat locals know dislikes outsiders or might be obvious, like howling cave wolves or giant spiders or lizards. Locals will react to the beasts' sounds, odours and moods

3 Undead - guard skeletons or zombies are left in key positions and, without a password, will raise an alarm, then attack. May be buried or stored in coffins or crypts or urns. May call other guardians or wandering monsters. They might be ancestors or bodies of intruders

4 Gremlins or other tiny humanoids and their pets use tiny vents and cracks and will warn those who aid them

5 Dungeon Mind Parasite feeds off hate, hostility and violence in dungeon inhabitants. Inhabitants feel anger and an awareness of an enemy sent by the parasite. It will be a gelatinous, tentacled being hidden in soil, water, a secret room or on the ethereal plane. It wants its regular thralls to do ok but if intruders will it will aid them and implant urges to settle in the dungeon 

6 Mirrors or Prisms or idols can be viewed by a magical orb or throne used by a dungeon boss. In some cases, the boss can even travel through the device

7 Idols or other art can be viewed through by a leader or magician. They might use spells, a magic item, blessing or spirits in the items to operate the idols

8 Nature Spirit of earth or caves or darkness invisibly roams, and alerts kindred creatures or receives worship and sacrifice by sentient monsters

9 Undead Spirit, possibly a monster's ancestor or some awful ancient ruler, haunts the dungeon. It hates living outsiders but has accepted worship from regular human visitors and others who respect it and bring gifts. It prioritises its own people or descendants

10 Dungeon Spirit has been receiving offerings for years by inhabitants, and it will warn them of invaders and increase the frequency of encounters, set traps and lock doors. It is malicious and wants the dungeon status quo to last forever. Spme might repair dungeon items or set traps, locks and alarms behind the party

11 Petty God roams the dungeon but not really hostile but may send messages to any dungeon creature it wants to warn them if the creature has been respectful to them. Adventurers might befriend the god or fight it. The god may protect young and injured monsters to ensure the creatures will survive  

12 Dungeon Demon or Imp aids the dungeon boss and spies on intruders. If it feels safe from possible harm, it will kill adventurers personally. It will alert guards and the boss if it feels any risk