From Halopedia, the Halo wiki
Unlike a typical Mgalekgolo pair, which splits a colony into two independent bodies, Goliaths are a Hunter-style body containing a single Lekgolo colony that optimizes brute strength over all other considerations, forgoing the typical assault cannon. Unlike normal Hunters, Goliaths are quadrupedal. Inside the Goliath’s armored shell most of the Lekgolo in the gestalt adapt to function as corded pseudo-muscle and thick-skinned protective bands, with a minimum of sensory and cognitive function. Goliaths are not easily self-sustained due to their ravenous hunger for nutrients, and are typically only seen in times of extreme danger among feral Lekgolo, but "Colony" of the Banished can coerce or direct subsidiary gestalts into this form seemingly at will.
Colony deployed Goliaths against the crew of the UNSC Spirit of Fire during the Second Ark Conflict in 2559 as a super-heavy infantry unit to protect areas Colony found of particular importance. In particular, Colony utilized Goliaths during Operation: SPEARBREAKER in May to defend a Forerunner Despair-class fighter it was attempting to launch against the Spirit of Fire. Goliaths were used by a Hunter Captain to heal himself after the UNSC forces managed to breach the Banished defenses against the fighter in a final attempt to stop the UNSC from preventing the launch. The effort failed and the fighter was destroyed by the UNSC to keep it out of Banished hands.
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