220k hp is realy low, i mean i deal atleast 60-70k with LB+EM+FS+LvB+CL with pvp gear. Killing him should take less then 30 seconds with bloodlust.

So it should be possible to spread out to avoid the aoe and possible let one or two die, if he doesnt hit hard your tank should survive it with a few cooldowns. (lay on hands+divine protection)