The Nui-Jaga are one of the many species to be created by the Brotherhood of Makuta using viruses and Energized Protodermis to populate the Matoran Universe. On Metru Nui, the Nui-Jaga lived in the canyons of Po-Metru. Some hunters went to hunt Nui Jaga for their stingers, but never returned. Most of the Nui-Jaga living on Metru Nui later migrated to the island of Mata Nui after the Great Cataclysm. There they were soon captured by Makuta and their Kanohi were replaced with Infected Kanohi, enslaving them.