@art17 Have you been reading this at all? He doesn't want people to know how strong he is, and while he'd rather not let people die, he prioritizes those he considers important to him. The only times he's really done anything were when he killed the undead king, and when he killed the demon in the first city, he hasn't really done much that might be considered too "out of the ordinary" since then. When he used the meteors during chapter 1 he was too panicked to care but he hasn't use it, in the manga at least, since then.