Gruntiness is the ultimate power of the universe that only the most powerful beings possess this devastating force. It is so powerful that even the Prophets and Soviet Russia fear its epic pwnage. It is even rumored that when a huge concentration of Gruntiness is used, it could begin the Rapture. This would explain why New Mombasa exploded when Flipyap died there. Grunts even use Gruntiness to control the entire Covenant behind the guise of cannon scrubbers.