These guys have ~15Khp. Piece of cake even with summoning game going on. Can easily go toe-2-toe with them casting. Probably stating the obvious, but lead with highest Magic-based Nuke, <summoned>, highest stun, highest Magic-based Nuke, fast-cast magic-based nuke x1 or 2, stun, rinse and repeat. Shouldn't have to really repeat as 62+ Wizzy.