Board Thread:Lore Discussion/@comment-13199219-20130809220651/@comment-13199219-20130814191511

To discuss the Flood, in the final book in the Forerunner saga, the gravemind told the Ur-Didact the flood could choose not to infect something if it wanted, which is the supposed "Civil War' within the flood the prehistoric human empire supposedly caused.


 * Possibly Spoiler Alert*

BTW, the Precursors (The creators of everything) are the flood. Long story, go to the Halopedia wiki if you want to know more.