I was actually excited about that! Maybe it could be something like:
Long before time had a name, there was the realm of the Oni and the Dragon. The Dragon had the power to create, the Oni had the power to destroy. From these two worlds came the First Spinjitzu Master, who used the Four Golden Weapons of Spinjitzu to create Ninjago. His eldest son, Garmadon, was swayed to evil, and it was up to his Master Wu to control him. And so, Wu and his four ninja crossed the realms to stop the darkness of the Oni in consuming Ninjago...