Rahi were the creatures that make up the wildlife of the Matoran Universe. Rahi, like other creatures in the Matoran universe, are biomechanical beings composed of both organic and inorganic Protodermis. Rahi also have in them Amana Volo energy and tiny amounts of Light. However, though they have enought light to be drained, it will not afect the Rahi's decisions.
Most of the Rahi have been created by Makuta using viruses and Energized Protodermis, as that was their original duty. Their Rahi populated the universe, guarding dangerous locations and serving the Matoran. However, when the Brotherhood of Makuta corrupted, they began to create Rahi for darker pruposes.
Some other Rahi weren't created by the Makuta. The First Rahi, gigantic sea creatures, were created by the Great Beings. The Energized Protodermis was also known to have create Rahi by mutating the enviroment, already existing Rahi or sapient beings.
After Mata Nui defeated Teridax, he combined his powers with the Ignika in order to restore Spherus Magna to its past state. In the process, all beings affected by the Pit Mutagen were cured, including the Rahi in Aqua Magna.
As Teridax was killed by a fragment of Bota Magna, the Rahi had to join the mass exodus to Spherus Magna to escape the Matoran Universe before it finally broke down. The Rahi that were kept in captivity under the archives of Metru Nui have been recently released, so they can survive. Here there is a list of them:
- Kanohi Dragon
- Kardas Dragon
- Kirikori Nui