Hundreds of years ago, something happened.
Two planes fused together.
One plane, called Mestai, an isolated plane with no planeswalkers. A plane with swordsmen known as 'keyblade masters'. A place where magic, light and darkness ruled all.
The other plane, called Agemosim, a place of war and tyranny. A plane where many 'antiheroes' rose up to defend their clans. A place where mana, magic and evil dwelled.
As they connected, landscape formed between the two planes. The connected equator was a land of elementals, nobodies and heartless.
Very few people noticed the fusion. But, as some people fled the war-infested areas of Agemosim, they came to this strange place. The worlds were not solidly connected, so the runaways saw no elementals, heartless, or anything that would threaten them. They crossed into Mestai. They came across the palace of Sweyhold, a castle as large as a small continent. The Agemosians were more than intimidated by the size of the castle, but when up to the front door anyway. They were welcomed by the people of Sweyhold.
The Agemosian refugees looked very different than those in the world of Mestai, but they opened up to eachother and trusted eachother. When word spread of a land beyond the land of Mestai, many kings and knights of Mestai rounded up armies and explorers to go there.
Little did they know, some Mestai explorers had already crossed into Agemosim. They were interrogated by an Agemosim dictator, and within months, Agemosian tyrants had started invading Mestai, and soon, Mestai was on the defensive. The flow of mana from Agemosim to Mestai and vice versa created a mana flow that solidified the glue of the planar fusion.
The new magic flowing throughout the worlds created newer and more dangerous magics. Wizards of both worlds experimented with other-worldly magic and the magic they were accustomed to. The combination resulted in spells that could make giant comets rain from the sky. It resulted in spells that could create vortexes and swallow up entire cities. It resulted in potions that could give a man immortality. Wizards soon realized the possibilities were endless. Mages of both worlds used their experimental magics in battles and duels.
Keyblades changed as well. The mana overwhelmed the keyblade system. This created a spell that could summon a keyblade. A small child could even wield a keyblade if they knew the spell. Keyblades that became overwhelmed with white mana became angelic and had the power to exile opponents to other dimensions. Blue mana keyblades could create illussions and had telekinetic properties. Black mana keyblades could kill someone with one hit and awaken the dead. A keyblade with red mana could give its user faster reflexes and the ability to control fire. Green mana keyblades gave their users tremondous strength and manipulation over wildlife. Some keyblades even became overwhelmed by more than one color of mana. They could even become overwhelmed with magic from Mestai and Agemosim at the same time. Just as spells had become powerful, keyblades had changed as well.
But the fusion of these two worlds would make more than just powerful magic, powerful keyblades and wars. It created a clash of two warriors that would change the fate of the two worlds forever.
