Sommers's devil fruit ability has been revealed - the Iba Iba no mi. This devil fruit is going to be powerful.
Saint Killingham is one of the Holy Knights, and he has one of the most overpowered Devil Fruits ever seen in One Piece.
The Rumble Rumble devil fruit was introduced in the Skypiea arc of the One Piece series and has not ... had a weakness, and it was no more than the Rubber Rubber devil fruit.