We just finished the first quest last night. We were able to take down Merrick and his Wrath Incarnate. I was wondering what the locked door was for? We never had any more instructions than explore the lair. There was nothing about finding a key and opening the door. What did I miss? What was in the room behind the locked door? I'm not going back to do it again so spoilers are ok. Thanks.
I am curious to this too. It may be an alternate route for easy mode :/