Meltie

A Meltie is a variation of a Stickie: it has a weak skin, and it's only purpose is to break itself aganist enemies. However, it's much more deadly, because its internal fluids are higly acid: it doesn't seem to have any effect on stone or metal, but it can dissolve organical matter (with the exception of bones) in a few seconds. The skin of a Meltie seems acidproof, but the Melties are seen generating bubbles on their skins, which then explode, emitting small quantity of acid. The reasons of this is unknown.