The Grey Gardens was host to the foulest of evil. There, dwarven runebinders practiced binding demons inside their runecraft to power their delves. Like the Defiant, they ignored the Vigil and gave themselves to the dark arts.
We must destroy the corruption within these foul vessels.
I can see why Penthas sent you to me, [%NAME]. When you say you'll do something, you do it. With the vessels cleansed, we can turn our attention to the fortress itself.