"Mgalekgolo (Ophis congregatio, meaning "serpent union"), more commonly known as Hunters, are a unique gestalt of smaller creatures known as Lekgolo, which are orange, worm-like creatures. Lekgolo were known to group together and form a Mgalekgolo for protection during combat, due to the form's increased strength at the cost of maneuverability. When grouped together, the intelligence of the Mgalekgolo colony is increased with every additional Lekgolo." 
                                                                                                                                             From halo.fandom.com