SPIRIT WARRIORS Spirit warriors

The whole world was destroyed, with nothing left but blood, dead bodies, and destroyed buildings. The demon lord had already opened the gate to the underworld, gradually fusing the underworld with the human world and spreading his corruption
The spirit of silence was devastated and the spirit of comfort was dead. It seemed all hope was lost, but the spirit of rage had one trick up his sleeve. He learnt a technique from his teacher which was used as a trump card only when things went really bad, but it was forbidden.
And when he did that he met a guardian who have him a challenge . In order to save his world, he had to both win the challenge and beat the demon Lord by all means and make the world a better place.
All he had to do was to start all over.
BUT,
WAS THIS A GOOD IDEA?