With gtb, use a marc water armor and a marse hood, then swap the armor to angeling if he asperios.
Without gtb, angeling+marse reduces magic damage to a minimal and the toad kills melee damage.
Then again, there are alot of things a high priest can do other than crasher/bolt/holy and smacking. Beware of weapon swaps :3
Or, you could always stack mdef resist and buy a cat-o-nintails footgear and another reflection item that I forget the name of and pray that the ice bolt/holy light reflects.