Starpower is a special currency that can be used to: 

• Buy Decorations and Monsters from the Starshop in the Market 
• Fugue Monsters on Paironormal Carnival
• Upgrade the Centri-Fugue on Paironormal Carnival
• Upgrade the Castle on Paironormal Carnival 
• Remove Obstacles on Paironormal Carnival

Starpower can be earned by: 

• Collecting Tribal Island Rewards 
• Collecting from Major Paironormal Monsters on Paironormal Carnival 
• Collecting it as a Bonus Item 
• Completing Versus challenges in The Colossingum