The current game is only played in a piece of the total world. Solaria is the name of the collection of lands in between the all of the other borders. The borders are a seemingly permanent nexus point with the Spirit Realm, creating walls hundreds of feet high and no one knows how deep of pure spiritual energy. Any who have witnessed a chance at crossing have reported the spirit of the crosser simply lift out of the body upon entry, and the body falling limp not five feet into the border.
There are 3 borders that surround Solaria. One to the east, one to the west, and one to the south. None have a recorded crossing as of the oldest texts available from over 3000 years ago, and those reference their creation. No texts in public history reference the lands beyond the borders.