I wonder if this was a glitch? I had quest markers on all three paths but the two topside paths were inaccessible due to EA restrictions. The one in the Underdark was usable though after some questing with shrooms and dark dwarves.
Actually, just checked, I don't have quest markers on *any* possible exit... the Travel to Moonlight Towers quest as such is triggered though, as said by killing Halsin and then aquiring the information from his body by casting the speak to dead spell. However, I have no quest lead to the Underdark whatsoever... that's all I got from his body. "Go to Moonrise Towers".
This is really, really weird.
