Has anyone found where to start this quest? Can't find it anywhere.

(there may be other threads asking the same question but i haven't found any.)

At the end of Dimhollow Cavern, the first quest you are sent on in the DLC, is Serana trapped in a stone Sarcophagus that rises from the floor. Wake her up and you complete Awakening.

Really? Then my game is bugged.

Did you wake up Serana? Because there's an Achievement tied to it.

Try a reload.

Can't reload, don't have a save and i have already beaten the whole DLC. Guess thats just 20g I will have to live without.