I can't remember if this character was in Buffy or Angel, but I'm pretty sure I remember he was talking to Angel.
Angel had enlisted his help to accomplish some task. His schtick was he absolutely couldn't lie, so he hated being asked questions, someone asks him a question and he quickly answers and immediately tells that person that if they try to ask another, he'd kill them.
He looks like a regular human man and carries a sword.
I've always wondered if this guy was based on a real mythological character or if he was created just for the show.
Anyone know who I'm talking about?