This creature is part of the Steel Realms Bestiary, but is uniquely associated with the Orrish in the Dark Lands.
The worms are raised in a bed of offal and blood, and rituals are spoken over them by the trap masters as they play a torturous bone whistle or pipe. unholy water is added as well as flesh from the dead. The worms grow to 25cm in length, and have a toothed mouth.
The Blood Vurms were originally created by Gorvyrm, Master of the Blood Vurms. Some of their stock was once stolen from the The Fields of Blood by the Orrish to create their Bloodworm pits.