BEHOLD THE UNSEEN IN THE REALM OF TORMENT! (I appreciate the irony by the way)
NOTES: I completed the entire quest track but none of the other dialogues were of note. Also you never see the Unseen. It remains....unseen. Also you stop it from being summoned so perhaps it never even got here.
For Conspiracy Theorists:
Could the Unseen be one of the UNSEEN!!!!!!!???!?!??!!?!?!?!? (Mursaat if you didn't get it)
I say: NO
But others...will contemplate I am sure.