Shanks is a character in the anime One Piece who underwent a transformation known as the "emperor's haki." This transformation is a special ability reserved only for exceptional individuals, and it grants them immense strength, courage and the ability to conquer even the most powerful enemies. The transformation is characterized by a sudden surge of power and a change in demeanor from calm and collected to fierce and determined. Shanks' transformation specifically involves him radiating an aura of power that causes even the strongest opponents to tremble in fear. This transformation is similar to a superhero's power-up or a warrior's battle cry, and it is considered to be one of the most powerful abilities in the One Piece universe. In essence, it is a transformation that denotes a great change in a character's mental and physical state, giving them an edge in combat that would otherwise be impossible to achieve.