Unknown, passive. The Proto-Gravemind, also known as the Proto-Compound Intelligence, is an advanced Flood form created from the biomass of the most intelligent living organisms available, with the ultimate goal of creating a fully-functional Gravemind.
http://halo.wikia.com/wiki/Proto-Gravemind
Answer Wiki. The Gravemind that appears in Halo 2 and 3 is not the same physical embodiment of the Gravemind that has appeared in the past. The Flood/Gravemind has some as yet unknown method of communicating with itself and it also has some unknown method of retaining its memories. The Gravemind forms once the Flood can collect enough mass, and when it forms, it has all of the memories, personalities of its predecessors. It is, in mind, the same being, but physically, it is new.
https://www.quora.com/In-Halo-2-how-did-the-Gravemind-survive-when-the-Forerunners-fired-the-ring-and-how-did-it-not-starve-for-100-000-years
Flood (Halo) The Flood are fictional parasitic alien life forms in the Halo video game series created by Bungie. They are introduced in Halo: Combat Evolved as a second enemy faction alongside the Covenant; they return in sequels Halo 2, Halo 3, Halo Wars, and as a gametype in Halo 4.
https://en.wikipedia.org/wiki/Flood_%28Halo%29
The Gravemind holds Master Chief and the Arbiter captive in Halo 2. The Gravemind is a parasitic, hive mind 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, in which the Flood becomes a superorganism. The Flood is a highly-infectious parasite which is released several times during Halo's story.
https://en.wikipedia.org/wiki/Gravemind
—The Gravemind. The Gravemind (Inferi sententia, meaning Thinking Dead), formally known as a compound intelligence, is the shared consciousness of the entire Flood species which first emerges when the Flood reaches the Coordinated Stage.
https://www.halopedia.org/Gravemind
“I am a monument to all your sins.”. — Gravemind. The Gravemind (Inferi sententia, meaning Thinking Dead), is the penultimate stage in the life cycle of the Flood and is the ultimate intelligence of the Flood. It is a near-omniscient creature with complete control over all Flood forms.
http://halo.wikia.com/wiki/Gravemind
Proto-Graveminds are a coagulation of multiple other Flood forms all merged. It appears that when an advanced task is at hand for the Flood, such as piloting a starship, they will create a Proto-Gravemind to do that task by merging as many hosts as possible with that knowledge, such as former pilots and officers.
http://halo.wikia.com/wiki/Proto-Gravemind
The player's discovery of the Flood in Halo: Combat Evolved is a major plot twist, and was one of the surprises reviewers noted positively upon release. The Flood's return in Halo 2 and Halo 3 was less enthusiastically praised.
https://en.wikipedia.org/wiki/Flood_%28Halo%29
Brace yourself. This is a long one. To properly explain the Gravemind, I'm going to have to start from the top. From what the Flood itself is, what its history is, and why they have a Gravemind. Way back, before any other life existed in the Halo universe, there were the Precursors. These were incredibly advanced beings, beyond anything we can properly even imagine.
https://www.quora.com/What-is-Gravemind-in-Halo
The Gravemind is, as its name suggests, the mind of the Flood parasite. When a creature is assimilated into the Flood, its knowledge is transferred directly to the Gravemind. In addition, it appears each Gravemind also retains the memories and knowledge of previous Graveminds.
https://www.halopedia.org/Gravemind
what is a flood gravemind
The Flood Gravemind or a compound intelligence is the shared consciousness of the entire Flood species which first emerges when the Flood reaches the Coordinated Stage. A flood gravemind is a compound intelligence that the shares consciousness of the entire Flood species which first emerges when the Flood reaches the Coordinated Stage.