Submitted a ticket for this but want to get the word out here too.
At the final part when rescuing warden Hywel, the Krait priestess summons 3-4 additional Krait. However with their new poison field abilities they kill Hywel in his cage making the mission impossible to complete. In addition the small platform allows them to stack these fields and instantly down a character of substantially higher level. (i.e. level 75, mission level is 64) This was not isolated, but occurred 3 separate times in succession when trying the mission.
Also maybe tone down the mobs a bit. With the new buffs the mission is really hard.