Classic Spike Pit: A trap door opens up below the character. Roll 1d6 for the number of spikes landed on, and then 1d4 damage for each. Optional: 50% chance of poison for each spike, with character losing 1 HP per minute until cured or dead.
Classic Snake Pit: A trap door opens up below the ch...
Classic Acid Rain: A half-globe of glass, mounted on the ceiling, is sensitive to smoke and similar particulate matter (such as glitterdust, sand, mist, vapour, and so on). If it detects such a substance, tiny spouts on it open, raining burning acid down upon the room.
Characters caught in the ar...