Luffy's strength has been constantly growing in One Piece, and Wano was the most significant arc for him. Luffy gained the power of Gear 5 in Wano, and this happened during his fight against Kaido.

Luffy’s Nika Fruit May Be Elbaf’s Legendary Devil Fruit. As revealed in Chapter 1130, one of Loki’s motives for killing his father, King Harald, was to get his hands on a mysterious, ...