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 effectively enabled the Flood the power of manipulating reality to an extent through their sheer power of thought, allowing them to tap into the neural physics of Precursor constructs such as star roads and use them as weapons against the Forerunners.

List of appearances

 * Halo: Silentium