Obsidian Warlock

From publisher blurb: When night falls, most people lock the door of their homes, try to forget the matters of the days, and rest until the sun rises again. For the Obsidian Warlock, the night is a thing of beauty that holds mysteries other mortals fail to fathom. This Prestige Class PDF is an easy-to-integrate PC class and just the sort of thing needed for DMs to add depth to any great d20 fantasy campaign world and gaming session.