Key mind

A Key Mind is a planetary-scale biological hub of the Flood's compound consciousness.

Description
The Key Minds and lesser compound forms, acting in concert as the Flood's mind, coordinated the Flood's efforts throughout the last years of their war with the Forerunners. Significantly larger than regular Gravemind forms, Key Minds are formed by the complete assimilation of planetary ecosystems by the Flood. They possess enormous processing power and are capable of extraordinary strategic planning, such as controlling entire battle fleets, and are more than a match for metarch-class ancillas. The widespread emergence of Key Minds during the Forerunner-Flood war marked a transition in the level of Gravemind intelligence, allowing them to tap into the neural physics of Precursor constructs such as star roads and use them as weapons against the Forerunners. Speculation on the part of the Librarian and Ur-Didact implies that the Gravemind used this capacity to infect space-time itself, mutating it sufficiently to be hostile to Forerunner Slipsace technology, and to give even starlight an oppressive, wholly hateful quality.

List of appearances

 * Halo: Silentium