Lunatic Cultist is just basically a filler boss with no real challenge or rewarding drops other than the Master Mode-exclusive phantasm dragon pet, but it’s cosmetic, so there’s no real weapons or accessories that the Cultist drops. I do however, have the unobtainable Expert Mode bags that he has but not in normal gameplay as on Xbox, a buddy of mine gave them to me although I did not expect to actually get them but these were interesting except they don’t even drop anything but his mask and the developer sets. These bags were just not worth having.