In ground combat, they were mostly victorious even against Sangheili.
The Covenant were further infuriated by the Lekgolo's destruction of Forerunner artifacts during the Mgalekgolo's routine feedings. Their physiology gave them a tremendous and unexpected advantage in combat, halting the Covenant's advance and killing an Arbiter. When the Covenant discovered the Mgalekgolo homeworld of Te, they intended on mining its riches, but faced heavy resistance from the Mgalekgolo.
