When Gear 4 Appear !exclusive! -

The result is a massive, hulking form with significantly smaller legs and a torso covered in dark, patterned Haki. His arms and torso become incredibly elastic, but the Haki hardens the outer layer, creating a compression effect. This allows Luffy to store immense potential energy within his muscles. When he strikes, he doesn’t just punch; he decompresses his arm at the point of impact, creating a devastating, rubbery cannonball-like attack with explosive force.

When Luffy finally confronts Doflamingo one-on-one atop the royal palace, he realizes that nothing in his current arsenal will break through Doflamingo’s awakened string powers or his "Overheat" attacks. With the lives of every citizen and his friends on the line, Luffy reveals his secret training from the two-year timeskip. Gear Fourth is fundamentally different from previous Gears. Instead of just pumping blood (Gear Second) or inflating his bones (Gear Third), Luffy blows air into his muscles and then coats his entire body with Busoshoku Haki (Armament Haki). when gear 4 appear

The battle reached a crisis point when Doflamingo unleashed his "Birdcage," an inescapable cage of unbreakable strings slowly closing in on the entire island of Dressrosa, promising to slaughter everyone inside. Luffy had already exhausted himself once using Gear Fourth prematurely against Doflamingo’s executive, Trebol, and had to be protected for 20 minutes to recover. The result is a massive, hulking form with