The combat stats of this monster may have changed since the Evolution of Combat update, and have not yet been confirmed in the live game. You can help the community by verifying the information in-game and then
submit a report with your findings.
You need not actually kill this monster. This is one of three forms of the High Priest - this one in particular will attack ranged-style. Use Protect from Ranged and keep attacking until the High Priest calms down.
Credits:
Ginger Warrior, Darkblade986, Jard Y Dooku, Paw Claw