lvl 13 - "mage"
necromancer pet + summon undead lvl 1.
What eventually worked for me [after 3 or 4 deaths] - have pet[s] draw aggro - he'll switch to melee weapon. I would then try to keep myself just out of his melee range so he wouldn't switch back to bow [ranged damage hurts] then just hit him with spells/drinking potions as needed.

In one battle - we both died at the same time... frown