Welzz was a large black male wels catfish who resided in the underground lake in the lair of the Doomwytes. Korvus Skurr believed the fish to be the spirit of his underground realm, as well as an oracle, and that his serpent Sicariss was capable of communicating with the creature. This however, was not the case; the fish had learned the the appearance of Sicariss usually meant something was going to be fed to him, and he rose to accept the food - not to communicate with the serpent, who was using Skurr's superstitions to her own advantage.