It's on the Ceiling!

d12
1. d100 Swords of Damocles
2. City of the Intellectual Bats
3. Manhole-like trap door to maintenance level
4. Tapestry of webs depicting events in spider history
5. Stalactite pueblo dwellers: evil dungeon fairies
6. Adventurers impaled on barbed spikes
7. The furniture: nailed up by prankster
8. Alarming amount of dripping water and muddy seepage
9. Pulsating illumination from strange glass tubes in metal fixtures
10. Shriekers!
11. Eyes (d1000)
12. Hand-chiseled diagram of dungeon level