Hm, that's a good point about the Hall of Echoes and Damian not knowing. Although, whether or not he knew, not killing you in the Primordial Cave didn't make sense. If he waited until you entered the Hall of Echoes, it's already too late., and he not only knew where it was after that, but had you cornered. And he could've also teleported out (as he did), then send his forces to that entrance while his cannon fodder captains kept you busy.
As for the time between Divine's death and ED, if the 50 year span was repeatedly brought up, I must've missed them all. It might've been mentioned in some flavor text books, but I couldn't recall.
