In One Piece Odyssey Usopp’s experience and skills will be taken from him. In order to get them back, you’ll need to locate 40 cube fragments scattered around Waford Island. Below is a guide on where to find his cube fragments in Dressrosa. You’ll receive the Cube Collector: Usopp trophy/achievement for finding all of his cube fragments.
Dressrosa City Area
Coliseum Path
This cube can be found in the southwestern part of the area along a flaming broken path.
New Royal Plateau: Bottom
1st Level – Great Fissure
This cube can be found on a rock ledge in a ravine on the northern side of the map.
1st Level – Great Fissure
This cube can be found on a broken bridge at the highest level in the northern part of the area.
3rd Level – Foot of Flower Hill
This cube can be found on a stone walkway east of the southern save point. You’ll need to use Chopper to reach it.
3rd Level – Flower Hill Bluff
This cube can be found on a light post along the wall you need to climb to reach the palace.