Wording is completely up to you, but a basis source would be something like, but not in these words: 'Fairly exhausting ability to launch a projectile that causes heavy explosive and heat damage. (result of character's own unique power).' I'd put area/volume/extent. I wouldn't go as far as planet destruction, but something along the lines of fair C-4 explosions? I'm happy to help however I can and you're welcome.