Staples writes:

I’d be interested in a Vornheim-style multi-column table of reasons why mega-dungeons were created or inhabited by new occupants. Thanks. ^__^

roll d100 The Dungeon is That was/is now By/For 01-02 a bank a hatchery for advertising executives 03-04 a boudoir a holy place for angels 05-06 a brewery a home for animals 07-08 a burrow a library for assassins 09-10 a cathedral a museum for bards 11-12 a cellar a zoo containing cannibals 13-14 a corpse a zoo to amuse criminals 15-16 a court abandoned by dead gods 17-18 a fetus all in the imagination of degenerates 19-20 a forge belongs to devils 21-22 a habit trail bought by dinosaurs 23-24 a hell built by dragons 25-26 a hunting grounds built for dwarves 27-28 a laboratory can be found on a treasure map elder gods 29-30 a lower plane claimed falsely by elementals 31-32 a market collateral for elves 33-34 a mating ground created for ettins 35-36 a memorial desecrated by eunuchs 37-38 a mine forgotten by faerie 39-40 a mode of transportation has baffled all attempts of explanation is commonly blamed on ghosts 41-42 a monastery in the shape of giant insects 43-44 a mortuary is claimed by giants 45-46 a natural cave is the holy land of gnomes 47-48 a natural formation lost in a dice game to goblins/orcs/etc. 49-50 a palace meant to lure gods 51-52 a pantry merely a map leading to (roll again) halflings 53-54 a paradise neutral ground for (roll 2) humankind 55-56 a parking garage protection for illusionists 57-58 a pocket dimension protection from living statues 59-60 a posh hotel recently remembered by lycanthropes 61-62 a prison redesigned by mages 63-64 a sanatorium shelter for medusae 65-66 a sewer shelter from monks 67-68 a ship sold to mushroom men 69-70 a skeleton taken from ninjas 71-72 a slave pit the ancestral homeland of people with animal heads 73-74 a small annex to (roll again) the basis for the stories of the pirates 75-76 a small box the boudoir of sadness elementals 77-78 a spawning place the city of sandworms 79-80 a stable the command center of sentient objects 81-82 a theater the garden of serpents 83-84 a training ground the home of snake men 85-86 a trap the nest of space aliens 87-88 a university the nursery of spiders 89-90 an abattoir the resting place of spooky children with psionics 91-92 an arena used to entertain the religious 93-94 an execution grounds used to train young titans 95-96 an imaginary place vacated by troglodytes 97-98 ruins where can be found the common ancestor of (roll 2 in column 3) undead 99-00 the homeland won in a dice game by vampires

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