Oz is a night raven companion who assists Fischl, an eccentric investigator for the Adventurers' Guild. He is voiced by Zhao Yuecheng (Chinese), Ben Pronsky (English), Yasunori Masutani (Japanese), and Lee Hyun (Korean). Oz helps interpret Fischl's words into plain speech, as she claims to be a princess from another world. In combat, Oz can be summoned through Fischl's Elemental Skill and performs joint attacks with her, dealing Electro damage. He remains on the field for 10 seconds with a 25-second cooldown and can trigger various effects when Fischl lands attacks or triggers Electro-related reactions.