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Kofo-Jaga are a species of scorpion Rahi that thrived in the heat of molten lava. The Onu-Matoran of Mata Nui feared them greatly, especially when access to the Lightstone Mines was cut. Miners often stumbled upon Kofo-Jaga nests when mining, and Turaga Whenua often had to be on-site when digging new tunnels to detect hidden Kofo-Jaga nests with his Drill of Onua.
Toa Nuva Onua and Whenua encountered a swarm of them during their search for the Kanohi Nuva. There were also Kofo-Jaga on Voya Nui, but these most likely did not survive the island's return to the Southern Continent.