Maybe not at worlds (since whoever is doing music for that has probably been contacted earlier then june) but if Pentakill had a live performance with costumes, that would be the bomb diggedity.
Maybe next year's worlds, some tournament, or what?
Maybe you could do an animation of them performing a song, like a Twist of Fate?
You have seen the true voice of metal fall quiet, surrounded by the massed harmonies of your weak whispers. But listen closely to those whispers, and you shall find the seed of truth. Four voices. Five harbingers of destruction, waiting patiently for their time to rise. And on that chosen day, these five shall change your world forever. Welcome to the era of metal.