Zolin Blood Priest is impossible

Dont really know, who the hell design this .what a stupid designed boss

I am playing as a Deadeye - level 65. I dont follow a build, trying an electrocution. The way i managed the fight is by using the Rhoa and staying far away. Once the buddy is down wait for my mana potion to be up and stack lightning rods on her and dps. She was not able to hit me once, It was a matter of DPS on time. In other words it is based on timing and luck.