I've looked through the forum and didn't find anyone else having this problem.
After I killed all the creatures that threathen Capitar for the purple King at the fort, I continue to go north over Krandir's Pass. I find Footprints two times and finally I find monsters and meet Ventris. He tells me to return to Krandir (wherever that is). And from this point on, nothing happens anymore.
I can go to the obsidian wall where it tells me that i can't pass it. If i continue north from Ventris, a message pops up:
"Tracking the Survivor:
Looking around, Relias realizes he has been following a false trail for some time now. He turns back to seek the survivors' tracks once more."
Great... I already found survivors?!!? So why this message... And i explored everything now, but no survivors anywhere (except Ventris).
And further north from Ventris there seems to be a way out (mountains to the north, obsidian wall to the west, mountains to the south, and krandir's pass south east and mountains to the east), but my army simply can't go there.....
Would be great if someone could help me, since everyone else has finished the campaign without any problems.