Trap

 is an Uncommon Dungeon Item that, when used in Dungeons, places a trap that explodes, dealing to  damage to enemies based upon the placer's floor.

Danger!
Placing this in the path of a silverfish in the silverfish puzzle will fail the puzzle, used by disgruntled players that are angry at their team, and to intentionally throw runs, or perhaps even by a clueless player attempting to lure a mob however are really spelling their own demise.