High Quality Content by WIKIPEDIA articles! The Gravemind is a parasitic intelligence in the Halo universe. While only one Gravemind is ever seen in the games, the title is given to the final stage of Flood evolution. The Flood is a highly-infectious parasite which is released several times during Halo`s story. The Chief and the Arbiter (Thel`Vadam, during the course of Halo 2 and Halo 3) are captured during their separate missions on Delta Halo, or Installation 05, by a Gravemind, which resides in the bowels of the ancient Forerunner ringworld, where the Flood creature forges an alliance between the two foes in order to stop the activation of the ringworld — an event which would destroy all sentient life, and, therefore, starve the Flood. The character is voiced by Dee Bradley Baker.