Chapter 784 is not just a fight chapter; it is a turning point in One Piece battle choreography. It took the simple, creative premise of "rubber man" and fused it with advanced Haki mechanics to create a transformation that felt both hilarious (Luffy as a bouncing giant) and terrifyingly powerful. For fans, the declaration remains one of the most spine-tingling moments in the series.
Unlike Gear Second (blood pumping, speed boost) and Gear Third (bone inflation, giant limb attacks), operates on a different principle: gear 4 chapter
The debut of Gear 4 marked a shift in One Piece power scaling. It proved that Luffy’s mastery over Haki was the key to competing with the and Emperors of the Sea , bridging the gap between his rubbery nature and top-tier combat efficiency. Chapter 784 is not just a fight chapter;
Oda established immediate consequences for Gear Fourth, which remain a staple of Luffy’s high-risk battles: Unlike Gear Second (blood pumping, speed boost) and
Maintaining the Haki coating on such a massive scale while maintaining the air pressure requires an absurd amount of energy. Luffy mentions early on that he can only use this form briefly because it drains his Haki rapidly. Once the timer runs out, he becomes vulnerable and unable to use Haki for 10 minutes (the famous "Haki recharge" period).
The chapter showcased two signature moves of Boundman: