There was a certain magical creature found mostly in the worlds of the Greater Universe. They were strange predators that assumed the form of mundane furnishings and objects in order to attract prey.
They were born with decent attainments in the School of Alteration. Technically, they could assume any shape, provided they retained the same internal volume. In order to effectively lure Magi, the most commonly took the shape of objects likely to be touched.
For example... a chest.
When this creature moved, jagged teeth appeared along the lid, and a thick, sticky tongue lashed out to grab its prey. Its body was coated in a viscous, adhesive slime, making it nearly impossible to pull away once caught.
It waited silently, patiently, blending in perfectly with its surroundings to lure its prey.