Kilgor and his father fought alongside one another in many of Krewlod's clan wars. The two sometimes killed behemoths together, but they never fought ancient behemoths.
On his eighteenth birthday, Kilgor decided to challenge his father to a duel for the right to lead the clan. Due to his superior skill and ferocity, Kilgor quickly slew his father. Some say that Kilgor's father died with a smile on his face, proud of his son's accomplishments.