Traps
Pit Traps
Boulder Traps
Mind-Game Traps
Quest for an Evil Dragon (also contains traps for an abandoned bandit hideout dungeon)
Ancient Green Dragon (CR 22) contains a variety of traps
Complex Traps
Cold Based Traps
Split the Party Traps
Lair Defenses
Adult Gold Dragon (CR 17) (Note: Passive traps, that work without the dragon)
Ancient Red Dragon (CR 24) Fire Based
Other Traps
Minor Traps
Green Dragon Wyrmling (CR 2) Simple Traps, made challenging by the dragon’s presence.
Ancient Black Dragon (CR 21) Using simple traps as a minefield, to make fighting it difficult.
Doppleganger (CR 4) Basic traps, easily changed with a lever that can be pressed by either side.
Maralith (CR 16) Using timed traps and platforms to make movement tricky.
Darkmantle (CR 1/2) Simple Traps inside Darkness
Crawling Claw (CR 0) Extremelly Minor Traps to slow players
Bugbear Chieftain (CR 3) When the enemy is threatening to unleash danger, and can’t be easily stopped.
Monster-Based Traps
Traps for the Player’s Arsenal
Complicated/Puzzle-like Traps
Puzzles
Coutal (CR 4) Turning change shape into a puzzle
Cloaker (CR 8) Basic puzzle, made tricky by a monster that is secretly an ally
Tests of Character