Star Pieces are hidden collectibles found throughout the game world. There are 100 in total. You can trade Star Pieces with Dazzle in Rogueport Sewers for powerful badges. The more Star Pieces you collect, the more badges Dazzle will offer. Shine Sprites are another collectible, used to upgrade your partners' abilities. For every three Shine Sprites you collect, you can visit Merlon in Rogueport to upgrade one of your partners, making their attacks stronger and unlocking new abilities. Both are crucial for maximizing your party's potential.
