Green Slime

A blob-like monster that inhabits damp areas like caves. They often appear without warning, frightening travelers. Though it appears to have a face on its outer surface, it's impossible to tell if it's even a single creature, or if it is even sentient. There are many people who can't stand its sticky appearance, and have a general dislike of them. It is thought that these slimes reproduce by splitting up, as once they inhabit an area, their numbers explode in the blink of an eye.