This culminates in the arc’s devastating climax. After Ace’s death, Luffy’s will shatters. His Conqueror’s Haki, which flared against the Marines, vanishes entirely. He lies catatonic, unable to even perceive Jimbe’s words. This is the most profound Haki lesson of all: Haki is the manifestation of living will. When that will breaks, so too does the power. Luffy’s failure to save Ace is not a failure of strength but a failure of spiritual mastery—he had the seed of a king, but not the cultivated garden.
stands as one of the most pivotal moments in the series, signaling his arrival among the world's elite powers. The Defining Moment
It is a common misconception that Luffy used Armament Haki to hurt Logia users at Marineford. luffy uses haki in marineford
At the height of the battle, Portgas D. Ace is on the execution platform, and the executioners are seconds away from ending his life. Whitebeard, weakened by illness and injuries, is unable to intervene in time. In a desperate, guttural scream for the executioners to stop, Luffy releases a raw shockwave of .
This is the specific type of Haki Luffy "used" in this arc. It is the power of the King’s Disposition, used to knock out those with weak wills. This culminates in the arc’s devastating climax
In , Luffy inadvertently unleashes Conqueror’s Haki (Haoushoku Haki) to stop the execution of his brother, Portgas D. Ace. As the executioners raise their blades, Luffy lets out a desperate scream that radiates a massive shockwave of willpower.
: Seeing Luffy's raw potential, Whitebeard ordered his entire crew to provide full support to the boy, effectively making Luffy the center of the pirate's offensive. Power Breakdown He lies catatonic, unable to even perceive Jimbe’s words
: The blast of energy knocks out the executioners and dozens of nearby Marine and pirate soldiers instantly.
The shockwave knocks out the executioners instantly, along with thousands of low-level Marines and pirates who lacked sufficient willpower to withstand it.
During the Summit War, Luffy had in Haki. He did not know what "Conqueror’s Haki" (Haoshoku Haki) was, nor did he know how to activate it at will.