Luffy's Gear 5 is strong, but it will evolve even further later on in One Piece.

Luffy's next Haki power-up, called Observation Killing, will allow him to reach the level of the likes of Shanks.

Luffy has received many amazing power-ups in One Piece over the years, but Gear 5 isn't the strongest of them all.

This article contains spoilers from One Piece's Elbaf Arc. One Piece is currently in the Final Saga, and at this point in the story, Oda is trying his best to wrap up Luffy's adventure as fast as he ...