Gravemind
The Gravemind is one of the main antagonists in the Halo series. It is a parasitic hive-mind intelligence and the leader of The Flood. The Gravemind is a collection of the sentience and knowledge that has been gathered by the victims of the Flood.
It is the overarching antagonist of Halo: Combat Evolved, a supporting antagonist in Halo 2, and one of the main antagonists of Halo 3 (alongside the Prophet of Truth).read more