A kobold cat herder with dozens of invisible cats. He will threaten the party but only unleash the pride when it's clear the party doesn't believe him.
A room with a chess board for a floor. After the party enters and maybe after a combat begins the 'black' squares shoot up into the room, then after a round or two, randomly determined, they switch with the 'white' ones.
9. A sword which is a work of art resting upon a pile of silver coins. The 'blade' is carved from what appears to be emerald; the handle and hilt are made of gold.
11. Stalactites the dragon can claw while in the air to drop down on intruders and theives
12. The wreckage of ancient ships lie scattered around the dark cave, small beams of light pierce the ceiling and fall upon the skeletons of once great vessels. This wyrm has taken to using plundered vessels as decorations in its lair.
13. The mountain the dragon calls home is hollowed out completely. Inside is a great spire that rises to the mountains peak. Here the dragon makes its nest. There are no stairs to climb the spire, it is perfect smooth except where The dragon's young have made small nests of their own.
14. In the dank marshes lies a terrible black dragon. Having long ago destroyed the empire and turned the verdant land to fetid swamps and bogs, the foul beast has performed century long necromantic rituals. Should the dragon even whisper a command an entire empire of ghosts will rise and obey the wyrms every command.
15. An entire wall of the lair is covered in runes. Should these runes be deciphered, they are revealed to be poetry so beautiful and moving that it would bring tears to a dwarf's eye to hear.
17. A room filled with glass bottles looking like a refuse pile. Each one contains a dungeon, touch one and you're pulled into it. Don't split the party.