OK he has around either 2100 or 2300 HP, depending on if boil blood does 400 or 500.
At 30 with SoW my necro was able to solo him, though i did go oom and was low on life...i hit him with 3 shots of boil blood, 2 dooming darkness (200 dmg), 2 hits of 132 dd, a 120 dd, and then a 160 dd. He doesn't like fear from a 30 necro, and resists my 34 chanter friends version often, so fear kiting is hard. Also my pet died early in battle because i messed up, so if you keep pet from taunting you will do better.
Me, 30 necro, and a 34 chanter took him easy..i used dooming darkness to pull, then hit with boil, and heart flutter (just to throw another dot in) and chanter just feared and did a few DD's