The mortal plane had a geographical structure that perplexed many scholars even to this day.
Once, there had been multiple continents surrounded on various sides by vast oceans. But one day, long before humans gained the ability to defend themselves, the Null Void appeared around the mortal land, dragging all of the continents together and creating a large mass of land with many interlocking waterways and borders separating them.
These masses of land were then attacked by the monsters that appeared from the Veil. The daemons destroyed more than two-thirds of the world when they first appeared.
There were no demigods and no means of stopping them from doing whatever they wanted, so they ran rampant across the land.
But along with the daemons, the gods of the Void also came into being.
Mythical gods that humans thought were nothing but fantasy turned out to be real, and many humans were chosen by these gods to be humanity's protectors.