Thejas has existed for thousands upon thousands of years, with a history now buried beneath ice, the sea, or simply the sands of time. Approximately two thousand years ago, an mysterious change swept across the land, with the planar alignment shifting in response to unknown forces.
Some claim it was the Gods themselves, some claim it was a mortal conspiracy, and some claim it was a natural catastrophe. Regardless, the planes began exerting influence over different parts of the world, sometimes radically transforming them, and the process has continued to the current day.
Much of the past has slipped into distant memory, though remnants and reminders can still be found.