Vulbats are a cross between a vulture and a vampire bat. They are clumsy and oafish, moving slowly and attacking as a 1 HD creature. On any successful bite, there is a 50% chance that a vulbat will infect a victim with a mild disease that, if uncured, will cause minor cramping and discomfort, causing afflicted creatures to attack with a -1 "to hit" penalty until cured. Additionally, on any natural “to hit” roll of 20, a vulbat will continue to drain blood from a victim at a rate of 1-2 points per melee round until the victim is dead or the vulbat is killed. Vulbats are immune to disease of all types.