Trappers are underground predators, chameleon-like creatures with flat bodies like a manta ray. They are roughly square in shape, about 20-ft by 20-ft in size (larger and smaller trappers, with proportionally higher or lower hit dice have been encountered), but can alter their dimensions to a considerable degree. These dangerous creatures lie flat on dungeon floors, waiting for prey to step onto them. While waiting in this manner, trappers are viurtually indistinguishable from the surrounding floor, 95% likely to be completely undetectable without the use of magic. When potential prey steps onto the trapper, the monster whips upward to enfold all creatures standing on it. The trapper’s stone-hard skin and powerful muscles are deadly. Victims enfolded in the trapper cannot use weapons and will suffocate in 6 rounds. Moreover, before suffocating, victims will suffer 4hp damage per round plus 1 hp per point of armour class. As noted above, trappers take half damage from fire and cold, and no damage at all from such attacks if the monster is entitled to a saving throw and succeeds.