Uruk Val was a Yuuzhan Vong warrior who served as Harrar's bodyguard during the Phyrexian War. An impressive physical specimen to say the least, Uruk was "at least as large as Shimrra", according to Luke Skywalker.
Uruk accompanied Harrar to the Valley of the Jedi to participate in what turned out to be the final battle of the Phyrexian War.
The Galactic Alliance may have forsaken the Jeedai, but the Yuuzhan Vong have not.
Uruk, having been promoted at some point after Harrar's death, was the leader of the Yuuzhan Vong task force that came to the aid of the Jedi at the Battle of Ossus. He was the only Yuuzhan Vong to survive the ground portion of the battle.