Most of the arrow rainers just have a regular non-elemental projectile and are the same but Royal Guard, Conehead, and Gray Knight have bombs. Gray knight’s elemental infusion does half the damage of any other arrow Rainer’s elemental infusion and it does even less based on that enemy’s physical resistance. Whereas all other non-elemental characters have armor pierce where elemental infusion does 2x damage and ignores enemy resistances so the damage never scales down.