I have to break another of Thane Pyrond's Agents out of the Dungeons deep deep below Saarnguard Keep. 

I put another disguise on top of my first disguise sneak past the Guards and get him out. 

I also get some help form a very unexpected quarter. 

Proving Grounds VI is now unlocked, I'll put off doing it for a bit because it is very very hard and cost of failure is steep.