Mgalekgolo
From Halopedia, the Halo wiki
The Mgalekgolo[1] is an assemblage of individual Lekgolo worms into a larger, more powerful organism.
The most common type of Mgalekgolo is known as a "Hunter", in which the individual Lekgolo form into a vaguely human-shaped creature approximately twelve feet tall, which can then be armed with a Fuel Rod Cannon, armored, and turned into an extremely powerful ground unit. This Mgalekgolo form is commonly employed by the Covenant. When a single colony of Mgalekgolo becomes too big, the colony will divide in half to create two independant Mgalekgolo colonies. These colonies will share an extremely close and mysterious bond, referred to only as being "bond brothers"[2]. Mgalekgolo that have split into "bond brothers" are recognized by spiked appendages that rise from their shoulders, which signify the fact that they are bonded to another Mgalekgolo[3].
It is unclear what other types of Mgalekgolo exist, as Lekgolo colonies have yet to be directly observed outside of combat. However, a strange, orange structure which closely resembles a group of Lekgolo worms has been observed in the core of Scarab walkers in Halo 3, making it a possibility that a Mgalekgolo colony is at the heart of every Scarab walker, though this type of colony has yet to recieve a name[4].
