Klingon Empire/House of Duras
Dur’ak is a member of the House of Duras. He grew up in the same area as Karr. Dur’ak used to lead the other children into teasing Karr about being a half breed.
He was the one who killed the women and children of the House of Krawles. He and the Duras sisters setup Karr as the ‘Butcher of the House of Krawles’. Karr is aware that Dur’ak and the Duras sisters are responsible.
He spent most of his time working as mercenary for hire. He is highly trained and likes to boast about being great fighter. Most of his stories of battle are from him killing the real heroes and claiming it for his own.