After the death of his wolf at the hands of humans, he was consumed with hate. Swift-Spear was the first Chief to begin a war against the nearby humans, killing several. His second spear was earned in this war, after which he changed his name to Two-Spear.
His hatred was a constant source of strife between him and his half-sister, Skyfire. Eventually, this strife escalated into conflict: Skyfire challenged him for the role of the Chief, and lost. Two-Spear took this opportunity to leave the holt, taking his followers with him, and leaving Skyfire in control of the few that chose to stay. On their journey, he died by a human assault.
He was partnered to Willowgreen, and it is heavily implied that her daughter, Kahvi, was his child.