Last night our static group ran Spawn of Whisperdoom for the first time. Well, first time for me and our rogue, but the ranger had tried to solo it earlier in the month.
We had some weird lag issues, with a DC for both me and the rogue and different points in the quest.
But, at the end, we took on Whisperdoom near the shrine and did take her down. Knight of the Chalice II for me, and Arcane Archer for the Ranger and we had enough DPS to make it work, at least on normal.