Can roomshield a couple rooms down of him if fearful of being followed. Spell up
Aggro on entry, if able to calm won't aggro again unless you leave and re-entry. Be careful on calming as it is a spook room and you can be spooked down which mean reaggro on reentry..
After calming, ff, plague, excom Poison(had to cast a couple times) web, slow (resisted a couple times) condemn magic if you have. Dispel if you don't have a timepiece as he has sanc, fireshield, haste.
Didn't see resistance to any weapon, but did most damage with axe.
He casts, flame wind, lightning, magic dart, fireball, acid, web, tremor, silence. His bash hurts the most, and on one round did 1545 damage with one bash.