Have you ever heard of a magical power that you can practice for five minutes and become invincible for two hours?
System: Congratulations to the master for achieving the achievement and receiving the reward of 100% original kidneys x 8. Congratulations to the master for becoming a man with nine kidneys!
Concept: Any civilization starts from scratch. The protagonist comes to the world of immortality in its original state to carry on the past and create a new legend.