The Darkpens are a large prison complex underneath Black Rook Hold. During the War of the Ancients the prison was used to hold the foul creatures of the Burning Legion. is the prison's commander appointed by Lord Ravencrest. The guards result to extreme torture to garner information from their prisoners. While perusing the trail of , was captured and sent to this prison.
A group of demon hunters, , , , and have all been captured and imprisoned here after hunting a dreadlord.