Gravemind (Form)

Gravemind is found on the Delta Halo (the one in Halo 2) and is apparentley the leader of the Flood. 'He' has the appearance of a giant venus fly trap and usually talkes in rhyme. First appearing in the interrogation of the Master Chief and the Arbiter, where the fallen elite commander finds out the truth of the Halo network. Gravemind then sends both the Master Chief and the Arbiter to stop the Halo, as he invades High Charity.

Many believe that Gravemind is also the original flood and altough he is sentient he is extremely hostile and manipulative in his actions.