Sakon Tigana was a fallen Jedi Knight who left the Order during the Clone Wars, expecting the Republic to end sooner than the others thought. After the Order 66, Tigana founded the Lighthunter, a light side organization, which the main goal he made was to bring peace to the galaxy while Jedi were no more.
In 17 BBY, Sakon was called by senator Organa, who informed him of finding the Jedi master Luminara Undily. Taking his apprentices with him, Tigana left the Lighthunters base to start his trip to Alderaan. Finally, that everything realized to be the Grand Inqusitor's plan so that the Lighthunters would end, just like the fallen Jedi Order.