Bai Yu encountered a bottleneck in his cultivation.

The transition from the sixth to the seventh tier is a significant hurdle, and many martial artists may be stuck here for decades without breaking through.

The third to sixth tiers are known as the Qi and Blood Realm, where one refines their bones and organs by circulating qi and blood.

The seventh to ninth tiers are called the Divine Transformation Realm, where one begins to transcend ordinary life.