Chilla Zin was a four-armed insectoid male who wielded four blades and was a member of the Assassin's Guild during the Imperial Era. Alongside the droid Gee-Ninety and the sniper Loriach, Zin was hired by the Sith assassin Ochi of Bestoon to assassinate a Crimson Dawn–allied pontiff on Vincorba. Unknown to Zin and his associates, the job was a test from Ochi's master, the Sith Lord Darth Vader, who recruited them in his quest to destroy Crimson Dawn.