Gate of Heaven and Earth

The Gate of Heaven and Earth is a seal Created by Makaze Kantoku for his children. Upon their birth he placed the seal on each of their backs. This seal works by restricting the power of the person by 90% but as they are so young and undeveloped the body simply ignores the power drain and they end up growing up and training without worry or backlash. This only works if it is placed on directly after birth however. This seal grows with the user and hides their true potential. The person is technically only using 10% of their strength at any given time. The seal can be released in stages allowing the user to slowly use more and more of their power. It can also be closed again later.

Levels
I'll add eventually