Sludge beast

From WoWWiki

This article or section contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and official bonus maps.

These strange creatures share an elemental heritage, but have been corrupted by the powers of chaos. Now they exist as tortured masses of semi-sapient goo. No one knows what their motivations are or if there is any specific ecology behind their existence.^{W3Man 88}