Has a very annoying HP AoE move that will drain 300-400+ hp everytime. There is pretty much no reason to melee since he will use this move majority of the time. Best bet is mages nuke the hell outta of it and move on.
To me, this didn't seem much different from your regular Qutrub. It appeared with Lamias, but I've only seen it once. Like most Qutrubs, it was very weak to magic but had a fair amount of HP. I didn't see him use any special attacks, at least none that would set him apart.
Got the kill with Burst II for 1500+, which was nice, but he apparently isn't cool enough to give the extra 80exp at the end of Besieged.