Dark Avenger

From publisher blurb:

When darkness falls over the city, they say that every shadow holds an assassin, that every nook in the wall hides a thief. The denizens of the large towns and metropolises fear the night and those who work during the dark hours. The villains that haunt the shadowy cities have little to fear, but they all dread the Dark Avenger. This four page Dark Avenger 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.