Kolaron? No. I tried him one time - got him down to 75% or so, lol.

The other two are on farm, but not that guy - I was just amazed at how many fireballs he put down in the course of a few seconds. The only way I could keep up was to move all my guys forward at once, but the DPS and heals stopping everytime he threw down a ball of flame made it slow. I ended up being a bit behind on the fireballs while trying to move my tanks around too - got messy fast.