The Prince dwells in the Castle of Forgotten Things in Thelanis. The castle seems to be its own distinct layer of Thelanis; if it exists in some other realm, its location has been forgotten. There are no doors that allow exit from the castle, and all windows are sealed and show scenes of places that have been forgotten. The only way to enter or leave the castle is through magic, whether by spell, through a manifest zone, or through a portal. Such portals can take many forms, such as the sack described in the legend above; normal people forget the location of a portal within an hour of discovering it, though player characters and other remarkable people could be immune to this effect. It’s possible characters could discover that what they assumed to be a normal bag of holding can serve as a portal to the Castle of Lost Things.