Kazgaroth

Kazgoroth is an aspect of Bhaal (Black Wizards, book 2 of Trilogy) that takes the form of anything it wants to and drinks human blood, as well as feasts on human flesh. It takes down many normally powerful people, like a druid, in the book Darkwalker on Moonshae.

Guises
Kazgoroth, to fit in, has taken several guises. The first few are a cow, which attracted a bit too much attention, and a woman, who drew much too much attention because Kazgoroth used its powers to make the body of the latter guise more attractive. His first victim was a man named Erian who was a guard for the prince Tristan of the Moonshaes.