I am throwing in the towel on this one. I have a mesmer with full exotic armor. I have tried this multiple times and at the end she just kills me – sometimes I can’t even tell how she did it. Our usual tricks do not work against the NPC. She ignores phantasms and clones. You cannot stay at range, her beam is not dodgable. You cannot stay close, she will wear you down. Reflectors do not work. Null field does not work, You cannot outheal her damage. She will kill you in 1 or 2 or hits. Cathe heals you, she kills you again until finally you don’t go into downed state, you just die. Mesmer is just too squishy. Perhaps a clan mate or three can help me with this. Perhaps when I get my Char with his 32k health to this NPC, then I can beat her. It is very frustrating to have come this far and hit the wall.