Annwn

from The Introduction:
Having fled a nightmarish future dominated by Serpent People (“Shadow Kingdoms”) or the dangers of the Nameless Mist (“The Tower”), the investigators wake knowing they must act quickly to stop a catastrophe befalling the world. The problem is, they’re not on earth, they’re in Annwn (pronounced an’oon), a deceivingly familiar dreamland bereft of humanity. The party slowly realizes something is wrong as they rush across the land, encountering evidence of hidden horrors. False hope dawns in the form of a Viking trading party, but they are just as lost as the investigators. Finally, after days of both mundane and supernatural hardships, the investigators find some answers and details of a route home...