Just soloed this bad boy with a 90 Cleric, no merc and self buffs only.
Most common hit from him was 431, as odd as I found that, but never hit more than 1100, which was not often.
Did not Flurry, Rampage or heal. Only dot cast was Sun Flare.
It was a real war of attrition, as this bugger has a ton of HP.
Fun fight, never the less :)

Baroque Half Mask of Solusek Ro
Gauntlets of the Burning Prince
Glyphed Rune Word
Gold Runed Mithril Knife
Raiment of the Fire Son
Spectral Parchment
The Orb of the Sun