Punja Rahab

Strategy

 * Easily beat the crap out of both Daeron Ashenwing and Vittia Direshadow. You'll need to at least 2-box (with mercs) to have a chance, and probably need a full group with at least 2 healers (merc or otherwise).
 * Punja Rahab has an AOE, Strike of the Massive, that hits 4 times in rapid succession for roughly 10% of your health each hit, and also stuns.