Pump up Divine favor and smiting and have at least 6 healing prayers.
Get a good smiting staff 10-19 or 11-21, something close to this range.
Take these skills with you and only these skills.
Retribution, Divine Boon, Healing Breeze, and Balthazar's Spirit and Bane Signet.
Put Retribution and Divine Boon and Baltahzar's on before you step on the third stone and skip the cutscene.
Hit tab or whatever you use to target. Get the wand shooting the mirror.
Use Bane. He might use it first, doesnt matter. Use it when it recycles and keep the wand shooting. Hit Healing breeze as needed.
You will stay full health or at least 3/4 full if you apply the healing breeze as needed. Balthazar's will keep you with enough mana from his damage to heal.
Retribution , the wand and the Bane will kill him.
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