Ur-viles are creatures of jet black color and are constructions of an extinct race named the Demondim. They are highly magical, possessing a number of supernatural abilities, including shooting acid, creating bolts of pure energy and the like. They are blind, lacking any form of visual organ, but possess a preternatural sense of smell. One of their most distinctive features is that when assembled in a wedge formation, the leader (or loremaster) at the apex wields the combined power of the entire group, without weakening any of their kin in the rest of the wedge. The ur-viles initially served Lord Foul, but later turned against him by creating the creature Vain (from which the new Staff of Law was created). In The Runes of the Earth, the ur-viles have actively joined the side of "good", tho