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I have an idea too: make the dreams appear in "The Unending Journey" book.
I was stupid enough to grab a glass of water while the game was loading, result: I missed the dream... I want to see it again!!!!!! T_T
I could be looking into it too much, but as far as I can see all the pieces fit, the imperial stronghold is in Mor Dhona (which is where the nightmare is based) the imperials have been attacking right outside the cities so it would be a wise choice to attempt to attack them head on and very little is known about the echo, the key point we know is that its because of the echo we can commune with the beast tribes, perhaps the twelve knew this was going to happen so created a few people that they could commune with, so we could know what will come if we fail.
I wouldn't put it past SE to do something like this. I could be making links that aren't really there, but we will see (can't wait for the imperial stronghold raid and legitus battles to see)
They will return, you have a chance at seeing them every time you log on.