Magnus
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So, for the light factions, these two buildings lead to a trial, right? One entrance, one exit.
It's possible to go through these as well, although it's unlikely. There's only one portal on the planet; it's more likely to be some kind of magic.
See my signature for the timeline. It's very condensed for Xeen, though.
No. I'm not talking about the walls of fog, but about ordinary buildings (e.g., Kreg Hag's House or Resurrectory).