Beast King by @jc (J. C.)

A piece of semi-Slayers fan art. Zelas, a mazoku lord known as the Beastmaster or Beast King, is in the form of a black wolf, along with a servant of hers. Zelas is the blue-eyed one in the front; but who is that in the back? Well, that's a secret. If you know a fair deal about the Slayers series and universe, you can make an educated guess. The art is (c) me, and Slayers is (c) to, um, those Slayers people. N.B: I did not draw that background. It is from an animation cel from an unknown series.