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Mana-Ko

Mana-Ko were fierce Rahi used by Makuta to guard his Mangaia lair. They were large, blocky-looking Rahi with the power to fire explosive blasts at opponents (or virtually anything else that attracted their attention). Although believed by the Toa and Matoran to be evil creatures, the Mana-Ko were in fact loyal to the Order of Mata Nui and were expected to oppose the Brotherhood of Makuta should a final battle arise.1

Notes

The Mana-Ko was a massive Rahi. It had eyes perched high in a red and yellow head. Its body was rectangular and blocky in shape, with two powerful arms and thick legs that ended in a solid band of armor. At both ends of the band were rolling treads. The Brotherhood of Makuta used Manas as guardians, but they always said they were just a sample – that the real power was the Mana-Ko. They were able to fire devastating blasts of energy that could disintegrate huge stone structures. The Mana-Ko that chased the Piraka out of Makuta's lair stopped short when the Piraka started ascending to the surface of Mata Nui. Zaktan supposed that Makuta had given them orders not to come to the surface, so that they would not kill the Matoran whom Makuta intended to rule.2

They are referred to as Mana Ko (no hyphen) in Legacy of Evil.2

The Mana-Ko were fierce, monstrous beasts. In Matoran legend, they were known as the ultimate guardian of Makuta's lair beneath Mata Nui. Their bodies were rectangular and blocky, with eyes perched high in a red and yellow head. Mana-Ko were able to fire explosive blasts of devastating power, which they eagerly used against anything that moved.3

Unbeknownst to anyone, not even the Brotherhood of Makuta, the Mana-Ko were actually loyal to the Order of Mata Nui. The Order allowed them to serve the Brotherhood as long as it suited their purposes. The Mana-Ko relayed information back to the Order. They were an effective means of keeping outsiders away from Brotherhood weapons and equipment, which the Order did not want anyone else having. The Order intended for the Mana-Ko to stand beside them in the final battle.3