Alliance of the Five Races

The Alliance of the Five Races was made between the Zokujin, Ningyo, Kenku, Troll, and Kitsu races.

Maelstrom
Ningen-do did not exist as mankind knew it. Everything was a tumultuous maelstrom of elemental energy, seething between the boundaries of the Spirit Realms. The Five Races came into being within the turmoil. Each of these races was marked by the power of a particular element, and all of them possessed powerful magic which they used to survive in their harsh primordial world.

Alliance
When the races found one another joined the strengths the others lacked, their powers complemented one another. The Five Races determined to combine their will to make a world that would last forever. In the center of chaos they created a vast city, the City of Night, and in the heart of this city they combined their most powerful magic in the form of a great crystal focus, balancing the five elements in harmony.

Ningen-do
They used the crystal and their magic to awaken the kami, which formed the boundaries between realms, forming the actual Ningen-do.

Losing strength
As the newborn kami grew in power the strength of the Five Races began to diminish. The wisest among them soon recognized they could no longer safely control the incredible power they had created – nor could they destroy it. Instead, they sealed off the city's heart and forbade further use of the crystal.

Jigoku
Jigoku looked upon the stability of Ningen-do with a terrible hunger. It wished to destroy this newborn world. It extended its dark tendrils into the mortal world and began to corrupt what it found there. It sent forth its servants, the ruthless oni, and began to wage war upon Ningen-do.

Destruction of the Alliance
Tsuno Kishenku, leader of the Tsuno Soultwisters, attacked the City of Night to get control of the crystal focus. It did it against his own race leaders, who believed the crystal too dangerous, even to use against Jigoku's forces. Kishenku proved right, and using the crystal incinerated most of the twisted invaders, but he lost control of the nemuranai and a wave of energy ripped through the City of Night, killing its inhabitants and turning the city itself into a strange purple crystal. The shockwaves rippled across the world, bringing death and ruin to all the cities of the Five Races.

Aftermath
The survivors hunted down Kishenku and his followers. For their crimes they were cast into the Realm of Slaughter. There, over time, they were twisted into the creatures now known as Tsuno. Descendants of the other races survived to this day but declined until the actual races known by the Rokugani.