The mysterious commune

The mysterious commune is a single building that looks like a farmhouse, that's somewhere north of Alwaysfall. The party travels there to look for Bittles who has gone missing.

The farmhouse has three doors inside. The left one leads to a seemingly neverending hallway, the middle one to a portal and the right one to a room where a bunch of cultists were in the middle of a weird ritual when we opened it.