Quick Guys...
He may not be impossible but the fact that his rewards don’t nearly justify the difficulty means nobody will be doing this event unless they raise the difficulty of everything else as well.
Not to mention, this boss is designed around cheap, old fashioned, game mechanics like high health pool, insta-death, and repetitive periods of loss of control. In reality this boss only offers more of a challenge due to the increase damage, health, and forced coordination. This was the wrong way to approach an open world event.