The Marineford Arc (chapters 550–580 of the manga, episodes 457–489 of the anime) is a turning point in One Piece . It is here that Monkey D. Luffy first demonstrates his latent Haoshoku Haki (Conqueror’s Haki) in front of the world’s elite forces. Unlike his later uses of this ability in Fish-Man Island or Wano, Luffy’s usage at Marineford is entirely unconscious, triggered by extreme emotional distress.
In conclusion, if you’re scanning the Marineford Arc for Luffy’s Conqueror’s Haki, look no further than the heartbreaking moment Jinbe holds him as Ace falls—because that’s the only time it appears, and it changes everything. when does luffy use conqueror's haki in marineford