Hackwen is a Redguard at the Daedric Shrine of Boethiah. The shrine is located in the Valus Mountains. Hackwen is the one to talk to about approaching the Daedra. He is unable to be killed without finishing the Boethia quest.
Boethia requires the Hero to prove their mettle in order to win his favor. The Hero have been told by one of Boethia's followers that in order to summon the Daedra, they must give a daedra heart as an offering to the statue.