The 798th Legion is attached to the Venator Class Star Destroyer Glory of Alderaan, flagship of the Azure Starburst Fleet. When Order 66 was issued, Admiral Kavion Ralter (future father of Dak Ralter) and his non-clone personnel took up arms agains any clones that attempted to kill the Jedi stationed aboard ship. Most clones sided with the Admiral and turned on the own brothers in the 798th. Commander Iceblood managed to kill Master Devt before being gunned down by Admiral Ralter himself. Being labelled a traitor to the New Order, Kavion ordered the Glory of Alderaan into hyperspace headed for the Unknown Regions. He later scuttled the star destroyer and formed a small militia, later joining forces with the Rebel Alliance.

*sidenote* The 798th Legion first came into being when I made a custom figure back in 2010. http://www.furaffinity.net/view/2597285/