After learning Draconic you can talk to Lord Nagafen, which is more easily done than last time by selecting the "Deserted" instance of the Oratorium and walking straight on to his lair.
When you hail Lord Nagafen make sure you are standing very close to him or you won't get it the dialogue to begin.
Also, you may run into a bug with the quest dialog (ie: when you hail Nagafen he says something but does not start a dialog). Simply re-log your character and the issue may correct itself. Stepping up on his platform (to get closer) may also work.
Be careful, If you anger Lord Nagafen, He will hit you for 400k. This will kill anyone around level 50 immediately, so be respectful.
Revive Lady Vox in The Crypt of Vox, entered via the large doors above the platform in the first room (past the doors) of Permafrost. To revive her, you need to have someone on the quest examine the essences in your inventory in the following order:
Essence Shard of Soul
Essence Shard of Heart
Essence Shard of Mind
After entering in the essences, click the totem in the room. This will kill the person that does it, and also set the lockout timer. There is no revive point in the zone so make sure they can be resurrected (if soloing, you can use a Scroll of Resurrection from one of the /claim rewards). If the totem is clicked prior to using the essences, an aggro Lady Vox will spawn and your party must then re-enter the zone in order to restart the sequence.
After reviving Lady Vox, hail her standing underneath to get your quest advancement.
You need to kill a special version of King Drayek. You need to enter the instance Drayek's Chamber: Throne of the Kromise King (from the same door as the regular Drayek's Chamber (top floor)) and kill Drayek. (Note: if you are very high level and kill Drayek too fast, you will break the encounter and be stuck on this step until the instance becomes resettable (a bit over 2 days)!) This reveals some more drama and ends the quest.
Go back to Lord Nagafen to complete the quest and pick up the next one Deception