Karsa is an elderly half orc sorcerer from the savage lands of Belkzen. He had fallen out of favour in his tribe and his daughter was about to be sacrificed by his tribal shaman, to Rull, orcish God of Thunder when both were saved by a group of Pathfinders. Unable to remain in Belkzen the pair travelled to Absalom where Karsa agreed to work for the Society in exchange for them taking in and training his daughter.
He is mostly bald with numerous arcane tattoo's covering his head and a shockingly white mass of stringy beard. Karsa is old far a half orc, well into his sixties, and walks with the aid of a cane. He dislikes young people and will often lecture them at length about how everything was better back in the old days. He seems to have an inexhaustible supply of boiled sweets which he carries in rather dirty looking little paper bags.