moat – (lave, slime, piranha, blood, etc)

minions – (evil dogs, zombie army, mutant clobberers, etc)

trapdoors and secret passages

dungeon – can be for prisoners or a lab/library or anything

supernatural energy – ghosts and spirits and hauntings

isolated or perilous location – Cave,swamp,ocean,mountain etc.

fucked up evil henchman -sidekick companion or familiar to assist/accompany

traps – for interlopers

fucked up evil library full of books

fucked up evil kitchen/potion lab stocked with stuff