I'm finding this a tough boss fight, maybe because I'm a sorcerer. This boss heals all the time and the fight could go on indefinitely. I think using knockback is somehow the answer, and I get up close and try interrupting the heal with my staff(both mouse buttons) but most of the time it doesn't work. My alt weapon is a healing staff, so that wouldn't be any help.
Just wondering what tips tricks others have used?