d100 veins cave system or dungeon ideas

1. bricked up tomb of beastily overgrown bones, scattered occultum. anyone exposed save vs. become guardian of the tomb
2. pocket dimension leads to inedible cornfield
3. ...the “tales of the scarecrow” cornfield
4. alligators just about to finally learn how to use the evolution machine from The Super Mario Bros movie
5. portal leads to clouds above surface, derro controlled (via skerples)
6. vault of cloned people all secretly derro in people-mechs
7. cavern has d40 corpses hanging from nooses, awakened by direct light, they strangle and die and fall and become broken-bone ghouls
8. doors teleport to distant but mutually visible segments of one open cavern, cavern has a giant and fast pariah
9. tomb of sorcerer king has been broken into pieces across a cave system
10. seemingly modern apartment complex with lots of small tubes which long-legged pale frog garrote-wielding people pull themselves through
11. apparent dungeon is, indeed, a deactivated divine beast a la breath of the wild, a mole which will only dig down
12. river styx makes you forget, or was it the lethe? roped together chameleon women ships, everthing is dead, there’s usually about one ghost of a giant snake per ship. also halfway through goblin pirates board maybe
13. descending library where each floor has books of only one word + evil librarians
14. limbs of inanimate stone octopus visible everwhere, big treasure is in mouth
15. dungeon is being carved by automatans
16. cryo-chambers let you try and wait out threats
17. chase leads to archean parlor
18. visible and vulnerable structural supports everywhere
19. dungeon is just very long, and empty. entrances into and out of are well-maintained airlocks. distances between places of interest are d20 miles of walk.
20. individual rooms scattered on the floor of a river bed
21. river flowing through structure has transformed part of it while leaving other parts intact. travellers pass through as you explore.
22. vicious cat colony
23. the dead here rise and all push on a tomb door to keep it shut. there are already some doing this.
24. thread leads to minotaur
25. dead and picked-over mailman w/ mail
26. … is actually fungus, this is how it spreads it’s spores. if you pick up mail, save vs. poison or you want to deliver the mail, if you eat the mailman save twice
27. behind brick wall is an ocean.
28. miniature voivodja made of fungus people imitating vampires
29. dungeon gets steadily more minature the further you get in
30. anything thrown or dropped explodes (from: aqua teen hunger force)
31. one room/cave is packed to the gills with alive bats and they all fly out when you open the door (or approach the cave entrance), it takes hours for them to fly out
32. amber hive empty except mantis shrimp, floor has sticky spots
33. gordion knot. if cut dead fetus plops out. impossible to untangle.
34. cave walls clearly fabric. if cut, larger cave is revealed. this was a fake cave.
35. minecart does a loop-de-loop (better as an interstice -ed)
36. the crawls here are actually filthy air ducts in a building. they sound hollow as you clomp-crawl through
37. nitroglycern creek.
38. anicent boat jamup.
39. slip-n-slide rivertubes + nets
40. moat below drawbridge has a trapdoor. if you manage to pull it open, the moat drains into a dungeon.
41. breakdown of sharp sea-urchin shells
42. pressure plate on stairs activates magnetic plate, grabbing metal, especially armor, and activates rolling boulder which zooms up the stairs.
43. time-damaged dungeon, when triggered, repairs to full glory.
44. sulphur gases barely contained behind easily breakable thing, when released you have to hide for a while while they disperse and burn and corrode the area and all its inhabitants. or don’t hide
45. gas leak elemental
46. marbles (dried ooliths) on floor + spiked wall
47. curse lizards try really hard to be your pet, says next bad thing to happen to you, it’s usually right and the thing happens pretty quickly. curses you if you eat it, duh
48. sand pouring into foyer, plugging holes just makes more. fills in 30 rounds
49. apparent portal to surface but roll d4:
1. all people only able to repeat one word, first word spoken by pc after entering portal
2. random fires become more and more common until everything begins to combust after 1 week
3. pcs start growing exponentially faster relative to surroundings, is noticiable after 2 days
4. as 3, but shrinking
   … after a week of this, at your option, there is large cracking sound and green light and then they’re back underground, next to the portal, now broken.
50. ash from torches lazily collects into ash elementals which regularly have to be squashed
51. paper ripped here explodes like firecrackers, there’s curse paper covering stuff.
52. dungeon room breaks off and slides down in rockslide.
53. a window shows that the whole structure is surrounded by void.
54. room is apparently full of ticking time-bombs.
55. “the dungeon which makes your face slough off if you stay too long.” face starts feeling heavy and it gets worse
56. notes to a dead lover are taped to various points
57. ward-eyes on sticks. can be eaten, but then they see inside you
58. thomas tank engine faces in dungeon walls, offer to swallow you, there is treasure + problems in their gullet, compete for your attention, nearby engraving says only one lies, too much competing information
59. goblin snatches big reward at last second and takes off on rockboard, there are other rockboards here. run as: a series of dex checks with riskier opportunities to catch up or do cool tricks
60. periodical really hot falling ash.
61. lava flow above ceiling door, warm to touch (from raggi’s “weird new world”)
62. invulnerable stalking automotan pursues but will run out of energy and take time to reboot.
63. jellyfish
64. large pile of trash is fungus designed to consume rag-and-bone ppl.
65. visibly different pariahs all have metal jaws teeth, then you meet the dungeon dentist.
66. pariahs have maces which replace ears, eyes, mouths, and noses with each other
67. surfaces unexpectedly beyond-freezing cold, skin sticks.
68. loud cat is good at fleeing and attracts pariah attention; they’re pursuing it, too (it’s worth 2,000 sp)
69. the walls can be tickled, cave laughs hard
70. floor liquidates after stepped on and drains down cave system.
71. sound of crows everywhere. eventually revealed to be waterfall on scratching oolites. ambush by oku happens now
72. there’s an ooze full of popping trapped air bubbles like instagram slime vids
73. “gates” of strong metal bars opened/closed by bending
74. Fallingwater with scissorfish.
75. dungeon/cave system terminates with new iteration of itself, fresh pariahs etc. 
76. grass, and then vines, it’s an underground jungle!  panther attack! monkeys steal your stuff! probably a gold mine, w/r/t calories. but watch out for the idol… if you need an excuse, why it’s underground, it’s all pale, although very humid.
77. dungeon is directly connected to a city through this door; you didn’t know, and everyone on the other side just never used that door
78. something outta Stonehell but 45° slope
79. cardboard box maze
80. superdense maze of sprung rusty blade traps. tetanus
81. crystal elementals jump off wall at you and shatter on contact
82. the pariah here only attacks if you try to leave its cave
83. wall is peeling banknotes, cave in danger of collapse into pile of money
84. head-sized hole. if you stick an appendage in, something bites it off
85. dividing walls of mercury which melt and drain when you walk away but recollect and solidify when you approach (from some unreal tournament modder I read about a decade ago)
86. mercury river, bad fumes
87. all pariahs are chained with collars, all treasures chained too, certain parts of the environment and architecture are chained
88. magnetic cave, gets worse than you’d think
89. pit with digestive lube + lube elementals
90. rocks sling out of darkness; your air movement springs natural stick bombs
91. any sound at all magnifies to literally deafening. this takes a second so you can plug your ears unless you’re busy. 
92. cave is full of whatever object the shape of the cave is
93. personal conversation audible in a foreign language. if translated:  it’s a numbers station (or hints -ed)
94. a tide
95. invisible wire everywhere
96. airlocks + bleached skeletons
97. utility tunnels with live wires
98. deep mud full of sharp crystals
99. gravity elemental
100. lots of unexpected perfectly clear glass walls