Twillingbottom's Field Guide
The carrion crawler resembles a cross between a giant cutworm and a large predatory cephalopod. Its slug-like body has many chitinous protrusions that help move it along as it crawls. Walls and even ceilings can be traversed quite rapidly on its multiple legs. Several spiny tentacles are used to attack its prey. These appendages secrete a paralytic slime which, when fresh, will work quickly on its victims. Its flat head has large spiked mandibles which can grind hard bone with ease.
The larval form of the crawler needs to be incubated for several weeks, in a warm damp place, such as a rotting pile of carrion. It has also been found that a living host can carry larva. Often unbeknownst to the host, the larva grows until the crawler burst from the body cavity, killing the host.
Once grown, the crawler eats anything that it comes across and can sink its mandibles into. They inhabit dark caves and caverns or subterranean lairs.