This guy is higher than lvl 24, he conned dark blue to my 41 druid. He is immune to all forms of snare/root/fear, hits pretty hard, and is a caster. In addition to necro/sk type spells he seems to proc a 160dd poison with his melee. Worst of all he summons, so stay clear of him if you can, he ripped me to pieces quickly.
Underconned? Hmm.. Blue to me at 36. Tried to also root, great immune.. Hmm, Ok, Dot with Immolate and Drones and let him eat some DD. Well, needless to say, his spells did alot more to me than I did to him. In one quick swipe I was at a bubble and a half, tried to heal, no change on the bubbles. DD'ed him again.. Loading, Please Wait. That was the next thing I saw. Taking my friend up there with me, I have some revenge that is needed.
Undercon is right. He gave me a heck of a fight with my 42 SK (Iksar, Moss/FBSS AC: +/- 890). Dark Blue con, but fought harder. I couldn't fear him or Dot/Dark him. Only thing that worked was lifetaps and thank Cazic for them or I'd be dead. I resisted a lot of the necro type spells, but the Poison (proc?) always got me. I finished him off with less than 2 bubs of health and no mana. He is an order of magnitude harder than all the other mobs in the mutant area, even the healers. I haven't fought him again, too risky for me, YMMV.