Yin-Yang Spell

A spell that stabilizes both Yin and Yang energies in the body, but obtaining such spell is the same as walking the path of death, as there will come a time that one will surpass the other, which will lead to death by explosion.

And the only way to completely solve it is by passing the 9 yin thunder and 9 suns thunder tribulation, according to the master of the infinite sect will be able to form two cores, which is only in theory, and Zi Chen becoming the first to succeeded thanks to the Lei yuan causing them to become one, also becoming part of his core formation. (Ch.693)