Using the power of the Nine Divine Palaces within the Mountain Sea Realm, he reversed himself at the cost of having over half of his divine palaces shattered, re-entering the void to gain a new talent.
If successful, his divine palaces should be restored to their original state. Failure would mean at the very least a setback to the early stage of the Mountain Sea Realm, with no chance of recovery for the rest of his life.
This secret technique is present in the foundational techniques of the seven great Sacred Lands. The Nine Heavens Stellar Technique that Chen Fei forged naturally includes this one, known as Reversal of the Stars.
Compared to the original foundational techniques of the Sacred Lands, Reversal of the Stars is more domineering, directly shattering eight divine palaces and forcefully tearing through the void.
This is a move that seeks life from death; without immense determination, success is virtually impossible.