The world has changed
Once upon a time, there was a girl who was neither selfless, nor brave.
Yet, when push came to shove, the girl sacrificed herself for the world, burning her very own soul to take down evil, until nothing is left of her but her will.
The will was imprinted in a wayward goddess Nuwa's power, subverting the rules of the universe themselves, transforming the world.
The people of great earth called the event 'Crashing'.
In the crashing, an unbearable amount of spirit energy flooded the world, finally uniting the physical world with the spiritual world, imposing laws of Nuwa throughout the world.
Nuwa, having exhausted her desires for control against the will of humans to survive. She perished in the end, unable to overcome the will of the human girl she intended to control.
Yet, this is not what the world is most impressed with.