So I got pretty lucky and got him a few days ago. I'm clearly at 3* with full mastery. I'm trying to figure out which way I should lean his gear towards. I normally go All Defense in slot 2, HP in slot 3, and defense pen. on slot 4, but I feel like I'm not doing him justice. I assume his Aether Bolt is his bread and butter, but I'm not sure if I should try to maximize the damage as much as possible. I was thinking of going critical damage/rate since Aether Bolt is a multi-hit skill and slapping on a critical booster (damage or rate). I haven't even consider an ISO set, either. I'm very much on the fence on how I want to develop him. I would love to hear any suggestions.