Kaido's death, Luffy Gear 5 plunges Kaido into volcanic lava

Gear 5 ("Gear Fifth") is the awakened form of the Gomu Gomu no Mi, which strengthens the user's rubbery body. It also allows the user the ability to manipulate and transform their environment, similar to a Paramecia's awakening. Luffy achieved this ability during his final battle with Kaidou on Onigashima.