The Karazhan Bosses were all unruly like this. They had to be killed within a set time, otherwise, they would finish the team off.
The stages of this Boss weren't obvious as there were two that kept on alternating. There were three skills that would be cast throughout these stages, one of which was Nether Burn. In theory, it could be avoided with the line of vision being cut off, and it could be resisted against too.
If you were in a favorable position you could not only avoid it, but even counterattack.
Because the skill could be resisted, Lu Li had March Rain provide everyone Shadow resistance. Nether Burn appeared like a fire skill, but it actually dealt Shadow damage.
There was also Void Zone. A target would be chosen at random, and at the Boss' feet, a Void Zone circle would be released, persisting for 15 seconds. Anyone within the zone would receive 1000 Shadow damage every 2 seconds.
