Gerlach is a gaunt, grey-skinned and hairless humanoid with glowing red eyes. He is given to muttering and spitting when he talks, which is rarely. He seems to spend most of his time lurking about in the shadows, scheming and snickering to himself. He wears no armor, a hair shirt, and barely wears clothing. He has carved hideous and depraved symbols into his flesh and is constantly recording his exploits in his own flesh. His preferred weapons are a wicked looking falchion and a shortbow.
He hates humanity and he hates human churches and clerics in particular. Over the spittle and cursing, he will tell you that his parents were killed by a raiding party, led by a human cleric to Pelor. He has made it his mission to destroy the priests and followers of that church wherever he can.