70 Dru w/tank merc, 68 Ench w/healer merc, 63 rogue. Dru rooted first add, Ench mezz 2nd add, tank and spank. Adds were DB to 70, not charmable. Got a mostly slowed message on named. Easiest thing to do is kill, loot, and evac. Adds have lots of HP. Was able to pacify all 3 and pull only the adds, but upon death they instantly repop at his side. Just keep adds CC'd through the fight.
i Dulcified him, pulled his 2 butt-buddies after he ran off a little ways. soloed them down, by the time he had pathed back past me his guards were almost dead, so i tagged him. fairly straightforward fight. easy enough to solo if you can find a sweetspot on the plateau that gnolls dont path through.
This is what I saw when I tried to take on this mob...
Roams near the Icefall Glacier zone area, always has 2 "a Darkfell gnoll" mobs following him, if you kill those 2 first he gets 2 more of the same mobs following him.
I cleared the area near the ramp to the zone, I pulled him and rooted him and zoned, came back and he and the 2 mobs (who weren't rooted) were near the base of the ramp. Root wore and they moved, so I pulled the adds rooted, zoned and came back and killed those 2, I went looking for him and found he had the 2 adds following him again.
I pulled him rooted him and the mobs around him, I debuffed and slowed them, I proceded to dot him and at 96% he summoned, his max hit was 1278 that I saw, even that was very rare. Seems his average hit was around 400 (with max defensive aa's and 20% block).
I didn't notice any spells cast off hand.
Probably safest to bring a real group to kill this mob.