Good reference, I forget the name of the vengeance demon... sorry "Justice Demon" that had that.
Lloyd. Here's the conversation in S7 Selfless:
D'HOFFRYN (low) Behold, D'Hoffryn. Lord of Arashmahar. He that turns the air to blood and rains— (turns to Willow, speaking normally) Miss Rosenberg. How lovely to see you again. Have you done something with your hair?
WILLOW Hello, D'Hoffryn.
D'HOFFRYN I figured I'd be hearing from you soon. The flaying of Warren Meers? Oh, truly inspired. That was water cooler vengeance. Lloyd has a sketch of it on his wall.