By Sylph.Hitetsu 2011-02-21 13:09:02
I accidentally popped this guy myself a while back. Dualboxing THF/WHM, I got it to 25% ish before Gravitic Horn 1-shot me (usually left me with ~8HP, but I didn't cure the last 200hp or so XD), typically it'd deal around the 1.6k mark.
When it uses Sandpit, whoever has hate on him will be bound and it will pop a smaller NM (can still hurt if it hits your mages), but they die in a few hits with ease.
Gravitic Horn will plant Gravity and will reset hate, so you may need to save a WS or something if you're waiting for it to WS, just to be safe.
Best advice I'd give though is to pull it away from the Weepers, otherwise you'll get a few links~