X-Men: What Happened To Everyone Who Became The Phoenix?
17. Korvus
The only surviving descendant of Rook'shir was kept alive so that he could live as a slave. After being offered the chance of freedom, so long as he agreed to hunt down and kill Rachel Summers, he jumped at the chance.
Attacking her, she grabbed the sword and they bonded, leading to a romantic entanglement between them. Rachel eventually broke this off and he found himself longing for space travel again. Becoming Captain of the Sovel Redhands, he left Earth.