War of the Oni and Dragons

The War of the Oni and Dragons is a conflict that took place in the Realm of Oni and Dragons. Predating the Final Battle, the crisis began due to both sides being sheer opposites in terms of power. The Dragons had the power to create, and the Oni had the power to destroy. The Oni and Dragons fought each other in a seemingly never-ending war and were led by The Omega, the leader of the Oni, and Firstborne, the Mother of all Dragons. The First Spinjitzu Master was born during this war and when he saw that neither side seemed intent on ending it, he decided to escape and create his own, called Ninjago.

History
The Realm of Oni and Dragons was inhabited by Oni, demon-like creatures with the powers of Destruction and Dragons, majestic like creatures with the powers of Creation. Because of being sheer opposites, both sides hated each other, causing chaos and war within the realm. One day a child, known as the First Spinjitzu Master, was born of both worlds, approached the Oni and the Dragons and demonstrated that they could both peacefully coexist. However, both sides wanted him as their own so they fought harder. During this time The First Spinjitzu Master befriended a dragon called Firstbourne and they together forged the Dragon Armor and sought to unite the realm, however, he saw there would never be peace so he abandoned his armor and left the Realm of Oni and Dragons in hopes of finding a new home and so he created Ninjago using the four Golden Weapons of Spinjitzu.