I have arcane nothing on my sorcerer. In fact, just an expedition rifle. The key was to move around to keep him out of the green puddles. Before the throws a puddle move to the outside so the puddles drop there. Then and attack. Before he throws another glob move to the other side. Having puddles in the middle made it very difficult as they healed him very quickly.
As for skills, at bosses I use 3 attack skills (fireball, lighting, ice) and shield.
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