Warpslime

Warpslime is a living, partially aware, and entirely unnatural creature that is born as a result of extensive Warpstone experimentation in a contained environment. This sticky ooze glows the same colour as that unholy stone and burns the skin like the blasts of a Warpfire Thrower, but its most dangerous property is its hunger for metal, particularly iron and copper. It needs to feed regularly on these, and creeps a long way to find them. Skaven engineers keep piles of scrap metal handy to throw into these pools at regular intervals, lest their work suddenly dissolve (and then explode) before their eyes. When they run out of scrap metal, they use slaves instead, because in a pinch the slime makes do with the minerals it finds in blood.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat
 * pg. 117

[[Category:W]]