I used Static Bolt to slow down his swing so I could get out of the way more easily. The curse used on him was Drown since I had NM using Frost Beam (Vine wouldn't get the benefit though it would reduce micro). He ended up chasing my CM around for awhile then decided to slug it out with my Dual Wielder (bad move since I had Rage waiting

).
Edited: it was damn annoying in Vet mode so I expect Elite to be hellish. If he hits with a glowing red axe, he gains around 20k HP (99k HP in total). Maybe my party wasn't strong enough to duke it out yet (still lvl53 at the Arena). Took me 5 minutes to kill him and got the armor from the Fire King set ^_^ (yay for effort).