Gugong jing

Gùgōng jǐng (故宫景) is a special, Ancient Superhuman martial arts style. In the Viz Manga, they are called the Lost Power. It is a Lost Style Created in the Void Century but was lost sometimes during the Rise of the Golden Era. The only Known user is Gol D. Yomi.

In order to become a User of the Gùgōng jǐng Style the User Must under go a Process Called Yínhún (银魂) a Process in which the user loses the Ability to use Haki in order to gain Supernatural Abilities and Attributes. When the user goes through Yínhún they also Lose Any Hope to of Eating any Devil Fruit for the power to use the Mysterious power of the Sea Stones.