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Can be staggered, but NOT riposted
I killed this guy the easy way by using Hidden Body and sniping him with a +9 Arbalest. Yes, I know, I'm pathetic.
I lured him to The bridge before that dragon. Se Both died. I got The set in his spawn location.
Hidden Body, Slumbering DragonCrest Ring, and Pestilent Mercury. Deadly combo that works on almost all mini-bosses.
Cast hidden body and approach him, stop a few steps from him, just so he wont aggro, then cast pestilent mercury.
Back away and notice he approaches the mercury himself. Cast hidden body often so you wont be caught.
He'll be dead without you breaking a sweat.
Don't think so

I was using hidden body to scope out the area and he aggroed me from a mile away. Hidden body doesn't seem to have any effect on him