For those born without a sense of humour, Halopedia has an article on Proto-Gravemind.
AV Johnson
This article is too damned short, Marine! You will help Gruntipedia by making it larger so it will fit the screen, fool!

The Proto-Gravemind, sometime known as a "Brain Form", is a form of Flood that is cryptophilic. It craves for more knowledge dead bodies! The Master Chief could have rescued Keyes if he got there before the brain started forming because the brain form requires many dead people, but the Chief, too cool to be understood, took his time.

Popcorn | Man Huggers | Soccer balls | Stalks-Miranda-a-lot | More annoying than a jackhole | Flood Version of Yo Mama | Badass Mofo Flood |

Rave to the Grave | Dumbmind