Summons (big suprise - very original thinking ...)
Didn't seem to hit very fast or hard, but I wasn't buffed for a summoner fight and didn't have the right spells memmed. With Reptile, DS, regen, CoS, etc. he is probably beatable by a petless soloer (Druid). Easily evaced between summons with quickened evac AA (2.5 sec).