I really believe I'm going to ask a very, very dumb question, but... how/where do I enter the Dera Reaches? I'm supposed to. I've joined Astoria's factions, solved her quests and now I'm asked by her to go there. I have the pass, Alwan gave it to me. So, where's the passage? My map's fully green (except for Gazak-Uss, of course) everywhere, I revisited every location to the south, and still I can't find a passage.