Just finished this guy... 2boxed 75 CoA geared Tank 17k hps 2900 ac 736 aa, 67 cleric 5500 pool 22 aa.
First and foremost kill all pathing mobs near the cornstalks. Make sure you have heals ready and tank ready to grab agro.
Used Final Stand disc and made sure to have lots of agro on tank. Mark and nukes didnt land on him so i had cler just heal. Beggining was kinda rough close call but had DI just incase, dropped a HoT and 4k heal then just chained cheals. Used Call of challenge like crazy.
Mob Flurries and attacks fairly fast. With Disc going didnt get hit for more than about 7-800 but hit fast like i said. Not slowed but once i got cheals rolling easy. Had antidote up to cure his snare after fight then the rest of this step was a cakewalk.
Overall took about 2 min to drop mob and 10 min to find note. First time he downed me when he was at 2% because i wasnt watching and ate rage :P and had an add.