Era beginning/end
The Era of Unification sees warring Astral Souls begin to come together, putting aside their titles of Starborn, Terraborn, etc, to instead live together under the banners of kingdoms. Starborn and Terraborn's specialized magic allows great strength together. Many great kingdoms rise and fall.
The Era of Unification began in what would eventually become Central. It is here Terraborn would breach the surface world with intent on wiping out the Starborn above all at once. Yet as armies reached the surface they were met with a group of three Starborn who had managed to sneak into their camps and arrive in the warband leaders tent. There they convinced the war leader that their army was not enough to wage war on all Starborn, but through their cooperation they could easily wipe out enough to establish a foothood in the surrounding lands. The end result was the opposite. The wars brought groups together like none before. Terraborn united with Starborn on the surface who they connected with and defied their underground rulers. The world became exponentially more unified. The rise and fall of empires, kingdoms, and more occurs throughout these years. By the end, early nations began to form. Central was the first to form. It had great power but small numbers. Northern was formed around the prismatic fountains that dotted the landscape, their defenses forever too great for Central to have penetrated. Western's land was ravaged, but through small surviving factions that turned to the arts to make light of their bad situation, a nation grew. Eastern grew from the ashes created by weapons the Starborn and Terraborn built during this time. They were rough, but started to harness what would eventually become known as Plasma. Southern began as outcasts of other groups came together with their studies of the occult and other darker magics. The environments found in the country were harsh, but allowed for secluded development away from Central's forces. It had the first connection to Far Side.