Performa is one of the game’s core aspects in Tokyo Mirage Sessions ♯FE.
It is described as people’s creative energy. Mirages are attracted to Performa and suck it out of people, leaving them drained with a sense of hopeless despair. Mirage Masters are able to form bonds with Mirages by willingly sharing their Performa.
When you win a battle, you’ll get experience points, skill points, and Performa. As you amass skill points, you can acquire new skills. You can use Performa material to create new weapons.