i never had to CC him at all! my first attempt was melee my second was with a bow... all i had to do was kite him keep my distance and wear him down. it was rather easy, when ever he went to heal with that sucking ability i just dodged back a couple times to get out of range and kept on hitting him at a distance and applying fire with my bow. fighting him at range in my opinion is the better option... i hope this helps!