booster amplifier

In the Land of Fiction, theme songs act as power boosters, massively amplifying a character’s power when played during a fight, with the level of power gained being equal to the awesomeness of the song. You are the LoF’s most famous Songsmith, and have forged theme songs for everyone from Batman to Optimus Prime. But today, you have received a special order: you must forge a song so awesome that it can boost a character’s power far enough to take down One Punch Man himself