The Antempus Universe - PCG Explained
Antempus was the time before time or the universe. In this time, only Krokenow and Mythar were alive, alongside a few other entities, and they created th PCG Universe that we know of today.
This universe is actually composed of 2 3D universes with the same rules of physics to eachother, and in the beginning was Spherical geometry, but after a long "time" (time didn't exist) the geometry became Euclidean. If it wasn't that the geometry became Euclidean, the PCG Universe may have been Spherical!
Depictions of how the Universe may have looked:[]
The Antempus Universe, showing some of the "links" in space.
Krokenow, Mythar, Brightgem, and Hodloki, standing in front of Mythar's temple.