A trapper is able to hide itself, either by blending into the scenary, or by mimicing a dungeon feature, such as a pile of coins etc. It has an animal body. It has no eyes, and is therefore impervious to gaze and blindness attacks. It has no limbs and no head. A trapper is a carnivore.
The trapper is a creature which has evolved a chameleon-like ability to blend into the dungeon surroundings. It captures its prey by remaining very still and blending into the surrounding dungeon features, until an unsuspecting creature passes by. It wraps itself around its prey and digests it.