Stone Rat
Small underground Rahi with teeth powerful enough to chew through nearly anything, and notorious for the plague they caused in Ta-Metru.
Stone Rats were small underground RahiRahiThe Rahi were the biomechanical wildlife of the Matoran Universe, built largely by the Brotherhood of Makuta, ranging from background fauna to engineered war beasts. that lived in most of Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive.'s districts. They're best known for the plague that hit Ta-MetruTa-MetruThe fire district where Ta-Matoran perfected their craft and powered Metru Nui's industry for thousands of years. when swarms of Nui-RamaNui-RamaLarge insect-like Rahi with deadly claws and venom, known for kidnapping Matoran and attacking Le-Koro. drove them from their nests. They weren't dangerous because of their size but because their teeth could chew through nearly anything. When the Toa MetruMetruIn the Matoran language a metru was a single district of Metru Nui; the city was divided into six such districts, one for each element, and the term covered both the place and the elemental community that lived in it. encountered them during the search for KrahkaKrahkaKrahka is a Rahi affiliated with various groups and known to have worn various Kanohi; only one of her kind remains., the infestation was a crisis layered on top of an already desperate mission.
What They Were#
Stone Rats occupied the underground passages beneath Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive.'s districts. Small as they were, they posed a genuine threat. Their defining characteristic was their exceptional bite strength. Such teeth could gnaw through materials most RahiRahiThe Rahi were the biomechanical wildlife of the Matoran Universe, built largely by the Brotherhood of Makuta, ranging from background fauna to engineered war beasts. couldn't breach, making them surprisingly dangerous when gathered in numbers. Underground, they'd established themselves in a specific ecological niche, feeding on whatever organic matter they could find in Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive.'s subterranean spaces.
The Ta-MetruTa-MetruThe fire district where Ta-Matoran perfected their craft and powered Metru Nui's industry for thousands of years. Outbreak#
The most significant recorded incident with Stone Rats occurred in Ta-MetruTa-MetruThe fire district where Ta-Matoran perfected their craft and powered Metru Nui's industry for thousands of years. when swarms of Nui-RamaNui-RamaLarge insect-like Rahi with deadly claws and venom, known for kidnapping Matoran and attacking Le-Koro. drove them from their underground nests. Overwhelming numbers invaded the district, creating a genuine crisis. The ToaThe Toa: Heroes of the Matoran UniverseThe Toa were biomechanical guardians sworn to protect the Matoran, bound by a strict code and defined by sacrifice across every age of the universe. MetruMetruIn the Matoran language a metru was a single district of Metru Nui; the city was divided into six such districts, one for each element, and the term covered both the place and the elemental community that lived in it. encountered the plague while already preoccupied with hunting KrahkaKrahkaKrahka is a Rahi affiliated with various groups and known to have worn various Kanohi; only one of her kind remains.. This timing proved particularly awkward, since the team was operating under constant pressure and with incomplete information about their mission. The incident reveals something about how Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive.'s ecosystem could collapse into chaos when one RahiRahiThe Rahi were the biomechanical wildlife of the Matoran Universe, built largely by the Brotherhood of Makuta, ranging from background fauna to engineered war beasts. species disrupted another's balance. Even creatures as small and seemingly insignificant as Stone Rats could become serious problems in the right circumstances.
Living in the Margins#
Stone Rats represent one of Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive.'s less-examined ecological realities. They weren't celebrated creatures. Yet everywhere in the city, they could be found. Their presence meant constant nuisance to the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body., even without plague-level infestations. The teeth that made them dangerous to infrastructure also made them difficult to eliminate once established. Controlling populations fell to local guards and pest controllers, unglamorous work that never appears in the chronicles. But that quiet maintenance of the city mattered as much to survival as the Toa's heroic struggles.
Compiled from primary sources by Lore Fortress editorial. Reviewed by Joe Garratt, Editor-in-Chief.
Sources
- SerialThe Mutran Chronicles — Greg Farshtey serial; features Stone Rats as native Metru Nui Rahi
- BookBIONICLE: Encyclopedia Updated — Comprehensive BIONICLE creature reference; includes Stone Rat entry
- WikiStone Rat
Spotted a factual error or a primary source we missed? Email a correction. Every flagged claim gets reviewed.
Related entries
Rahi
The Rahi were the biomechanical wildlife of the Matoran Universe, built largely by the Brotherhood of Makuta, ranging from background fauna to engineered war beasts.
Metru
In the Matoran language a metru was a single district of Metru Nui; the city was divided into six such districts, one for each element, and the term covered both the place and the elemental community that lived in it.
Krahka
Krahka is a Rahi affiliated with various groups and known to have worn various Kanohi; only one of her kind remains.
The Toa: Heroes of the Matoran Universe
The Toa were biomechanical guardians sworn to protect the Matoran, bound by a strict code and defined by sacrifice across every age of the universe.
Ta-Metru
The fire district where Ta-Matoran perfected their craft and powered Metru Nui's industry for thousands of years.
Nui-Rama
Large insect-like Rahi with deadly claws and venom, known for kidnapping Matoran and attacking Le-Koro.
Mentioned in1 entry
Get new articles in your inbox
No spam. New lore drops, canon conflicts, and deep dives only when they’re worth reading.
Some links on Lore Fortress are affiliate links. If you buy through them we earn a small commission at no extra cost to you.






