Ussal
The Working Rahi of the Matoran Universe
Six-legged crustacean Rahi domesticated across Metru Nui and Mata Nui for cargo, mining, and sport. Backbone of Matoran labor.

The Ussal was a six-legged armored 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. domesticated across the Matoran UniverseMatoran UniverseA civilization of biomechanical beings living inside a colossal robot, destroyed when Teridax seized control. for labor, transport, and defense. Native to both Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive. and Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years., Ussal teams hauled cargo through Le-MetruLe-MetruThe teal district where Le-Matoran managed everything that moved through Metru Nui, from chutes to airships.'s skyways, drove the mining shafts of Onu-WahiOnu-WahiThe underground kingdom of Mata Nui, home to the Onu-Matoran and Toa Onua., and carried MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. riders through tunnels too dark and tight for most other 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. to navigate.
Biology and form#

Ussal were large crustacean 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. built low to the ground on multiple jointed legs, with a thick carapace that could withstand cave-ins and 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. attacks. Their pincers varied by individual and role. Standard specimens carried natural claws, while mining variants in Onu-WahiOnu-WahiThe underground kingdom of Mata Nui, home to the Onu-Matoran and Toa Onua. were fitted with mechanical saws in place of their natural pincers to bore through rock. A rugged breed known as the Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. lived on Voya NuiVoya NuiAn island born from catastrophe and hiding the universe's most powerful artifact, Voya Nui was everything Bionicle 2006 promised: danger, mystery, and a race against time., distinguished by heavier carapaces and pincers adapted to volcanic terrain.
Despite their bulk, Ussal were agile, capable of darting through chasms and scaling ridges. They were strong enough to carry heavy loads and docile enough under training to serve as steady cargo animals. Ussal underwent a significant life-cycle transformation, evolving into larger and stronger forms at later stages, though the exact mechanism of this process was not documented. Specimens that reached the fully evolved stage attained considerable size and aggression, as 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. learned during an encounter in the Onu-MetruOnu-MetruThe deep archive-city that made mining and historical records preservation the beating heart of Metru Nui. Archives.
Service in Metru Nui#
In Le-MetruLe-MetruThe teal district where Le-Matoran managed everything that moved through Metru Nui, from chutes to airships., Le-MatoranLe-MatoranGreen-powered Matoran obsessed with thrills and transport. They're basically Bionicle's daredevils. drivers used Ussal to haul disk shipments, tools, and supplies along the city's narrow bridges and turnarounds. The 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.'s strength and steady temperament made them well suited to the chute network's tight tolerances. MatauMatauA former Le-Metru test driver who became a Toa Metru, Matau wielded air, illusion, and shape-shifting before sacrificing his Toa power to wake the sleeping Matoran. recorded OrkahmOrkahmOrkahm was a Le-Matoran Ussal rider of Le-Metru, Matau's chief rival, one of the six finders of a Great Disk, and later a Gukko Force member on Mata Nui.'s Ussal, PewkuPewkuPewku is an Ussal, a species of Rahi crab associated with the Onu-Matoran, native to Metru Nui and later found on Spherus Magna. Originally blue and orange-yellow in coloration, Pewku molted to a burnt orange, silver, and brown coloring. Legs and claws served as Pewku's primary tools., by name, evidence that individual bonds formed between rider and crab.
Onu-MetruOnu-MetruThe deep archive-city that made mining and historical records preservation the beating heart of Metru Nui. maintained the UssalryUssalryOnu-Koro's branch of the Mata Nui Military, made up of Onu-Matoran riders mounted on tamed Ussal crabs and led by High Commander Onepu., elite squads that used Ussal for both transport and defense within the Archives. These crabs patrolled deep tunnels and helped guard valuable artifacts, including the Great Disks. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui., a seasoned UssalryUssalryOnu-Koro's branch of the Mata Nui Military, made up of Onu-Matoran riders mounted on tamed Ussal crabs and led by High Commander Onepu. rider, drew on his training during the search for the Onu-MetruOnu-MetruThe deep archive-city that made mining and historical records preservation the beating heart of Metru Nui. Great Disk when he and NujuNujuNuju served as a Ko-Metru seer, Toa Metru of Ice, and Turaga of Ko-Koro who spoke only in bird calls translated by Matoro. entered a chamber holding a Giant Mutant Ussal CrabUssal CrabUssal crabs were the riding and cargo Rahi of the Onu-Matoran, used as transport in Onu-Metru and as the mainstay of the Onu-Koro Ussalry.. The creature attacked without warning. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui. drove it back with the high-frequency whine of his drilling tools, and the two Toa retreated. The mutant was untamed and feral, more 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. than work animal.
In casual speech, the Ussal had become synonymous with docile labor. During the events recorded in Federation of FearFederation of FearAn Order of Mata Nui strike team of imprisoned villains, led by Brutaka, rescued Makuta Miserix from the volcanic prison of Artidax to install him as the figurehead of the coming war against the Brotherhood., BrutakaBrutakaBrutaka guarded the Kanohi Ignika on Voya Nui, betrayed the Order during the Piraka incursion, served time in the Pit, and later led the Federation of Fear strike team. used the comparison "a big, cuddly Ussal crab" as an insult, evidence of how widely the species was understood as harmless cargo stock.
Service on Mata Nui#

After the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. exodus to Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years., Onu-KoroOnu-KoroOnu-Koro was the earth engineers' city, where underground isolation created one of Mata Nui's most self-sufficient settlements, until the Bohrok came. maintained the deepest working relationship with the species. Ussal teams pulled carts through the tunnels of Onu-WahiOnu-WahiThe underground kingdom of Mata Nui, home to the Onu-Matoran and Toa Onua., hauling protodermis and other resources from the lowest chasms. Some were modified with saw-pincers for excavation. The UssalryUssalryOnu-Koro's branch of the Mata Nui Military, made up of Onu-Matoran riders mounted on tamed Ussal crabs and led by High Commander Onepu. operated as a specialized corps of miners and mounted defenders, distinct from the village's ground forces governed by TuragaTuragaFormer Toa who fulfilled their destiny and transformed into leaders. Turaga wield Noble Kanohi masks and weakened elemental powers, guiding their communities. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui..
The Great Ussal Race was a formal sporting event chronicled in the Archives by HahliHahliA Ga-Matoran scholar who rose to become Chronicler of Mata Nui, then Toa Inika, then Toa Mahri of Water during the final crises of the Matoran Universe.. Riders and crabs competed before crowds of MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. spectators, indicating that Ussal were not only beasts of burden but recognized athletes with measurable speed and endurance.
Pewku and the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. bond#
The most documented Ussal in the historical record was PewkuPewkuPewku is an Ussal, a species of Rahi crab associated with the Onu-Matoran, native to Metru Nui and later found on Spherus Magna. Originally blue and orange-yellow in coloration, Pewku molted to a burnt orange, silver, and brown coloring. Legs and claws served as Pewku's primary tools., the Ussal kept by the chronicler TakuaTakuaAn Av-Matoran hidden on Mata Nui as a Ta-Matoran, who gathered the Toa Stones, served as Chronicler, and ultimately accepted the Avohkii to become Takanuva, the Toa of Light.. PewkuPewkuPewku is an Ussal, a species of Rahi crab associated with the Onu-Matoran, native to Metru Nui and later found on Spherus Magna. Originally blue and orange-yellow in coloration, Pewku molted to a burnt orange, silver, and brown coloring. Legs and claws served as Pewku's primary tools. carried TakuaTakuaAn Av-Matoran hidden on Mata Nui as a Ta-Matoran, who gathered the Toa Stones, served as Chronicler, and ultimately accepted the Avohkii to become Takanuva, the Toa of Light. across Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years. during his travels between villages, through tunnels, and away from BohrokBohrokHive-minded mechanical creatures designed to reshape worlds, the Bohrok represent a threat the Toa Mata never expected. engagements. MatauMatauA former Le-Metru test driver who became a Toa Metru, Matau wielded air, illusion, and shape-shifting before sacrificing his Toa power to wake the sleeping Matoran. later discovered a carving of the name "PewkuPewkuPewku is an Ussal, a species of Rahi crab associated with the Onu-Matoran, native to Metru Nui and later found on Spherus Magna. Originally blue and orange-yellow in coloration, Pewku molted to a burnt orange, silver, and brown coloring. Legs and claws served as Pewku's primary tools." in Le-WahiLe-WahiLe-Wahi is a region on the island of Mata Nui, inhabited by the Le-Matoran and Rahi. Formerly subject to the power of Teridax, the region is no longer under that influence. on Metru NuiMetru NuiThe city beneath Mata Nui functions as the Great Spirit's brain, housing the Matoran whose labor keeps the god alive., confirming that the bond between rider and 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. predated the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. exile.
Ussal occupied an unusual position in MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. life. They held no elemental abilities or KanohiKanohiMasks that grant powers and sustain life, they're the most vital artifact in the Matoran Universe., yet they were reliable enough to be trusted in total darkness, deep within tunnels where a single misstep meant collapse. The Onu-KoroOnu-KoroOnu-Koro was the earth engineers' city, where underground isolation created one of Mata Nui's most self-sufficient settlements, until the Bohrok came. UssalryUssalryOnu-Koro's branch of the Mata Nui Military, made up of Onu-Matoran riders mounted on tamed Ussal crabs and led by High Commander Onepu. depended on this trust between species, and individual MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. often formed sustained relationships with their assigned mounts.
Variants and adaptations#
The Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. of Voya NuiVoya NuiAn island born from catastrophe and hiding the universe's most powerful artifact, Voya Nui was everything Bionicle 2006 promised: danger, mystery, and a race against time. were a regional variant adapted to the island's harsh volcanic terrain. They carried heavier carapaces and pincers built for cracking volcanic rock rather than hauling cargo. Unlike mining Ussal of Onu-WahiOnu-WahiThe underground kingdom of Mata Nui, home to the Onu-Matoran and Toa Onua., Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. retained natural pincers shaped by their environment, with no need for mechanical attachments.
During the PirakaPirakaSix rogue Skakdi mercenaries who broke from the Dark Hunters to hunt the Mask of Life on Voya Nui. occupation of Voya NuiVoya NuiAn island born from catastrophe and hiding the universe's most powerful artifact, Voya Nui was everything Bionicle 2006 promised: danger, mystery, and a race against time., Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. continued to inhabit the island's fractured zones. No record confirms that any Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. was successfully tamed by the occupying forces or by the local MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. resistance.
Inconsistencies in the record#
Several details concerning Ussal vary across surviving sources. Their depicted size ranges from large enough to carry a MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. rider, as shown in the Mata NuiMata NuiBuilt by the Great Beings to restore Spherus Magna, Mata Nui sustained an entire civilisation inside his body, was deposed by Teridax, and reclaimed his purpose as a mortal on Bara Magna. Online Game and during the events of the Mask of LightKanohi Mask of Light and ShadowA single fused Kanohi formed in Energized Protodermis when Takanuva and Teridax merged into Takutanuva, holding both light and shadow at once. era, to small enough to be mistaken for a domestic animal in earlier Onu-KoroOnu-KoroOnu-Koro was the earth engineers' city, where underground isolation created one of Mata Nui's most self-sufficient settlements, until the Bohrok came. records. No standard measurement appears in any primary archive.
The evolution mechanic that produces larger, stronger forms is referenced but never directly observed in known accounts. PewkuPewkuPewku is an Ussal, a species of Rahi crab associated with the Onu-Matoran, native to Metru Nui and later found on Spherus Magna. Originally blue and orange-yellow in coloration, Pewku molted to a burnt orange, silver, and brown coloring. Legs and claws served as Pewku's primary tools. and other named specimens never display any transformation in the surviving record. Whether evolved Ussal were rare, regional, or simply absent from documented events is unclear. Rock UssalRock UssalThe most common Ussal species on Voya Nui, notable for unusual aggression in the online game. are cited as a distinct variant but are not directly linked to mature common Ussal.
Legacy#
Ussal endured as one of the most essential working species in the Matoran UniverseMatoran UniverseA civilization of biomechanical beings living inside a colossal robot, destroyed when Teridax seized control.. They moved supply lines, enabled mining, supported military patrols, and carried individual MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. across hostile terrain. They were neither elemental nor sentient, but the daily operation of villages such as Onu-KoroOnu-KoroOnu-Koro was the earth engineers' city, where underground isolation created one of Mata Nui's most self-sufficient settlements, until the Bohrok came. and Le-MetruLe-MetruThe teal district where Le-Matoran managed everything that moved through Metru Nui, from chutes to airships. would have failed without them. Their presence in records of events as varied as the BohrokBohrokHive-minded mechanical creatures designed to reshape worlds, the Bohrok represent a threat the Toa Mata never expected. crisis and the Federation of FearFederation of FearAn Order of Mata Nui strike team of imprisoned villains, led by Brutaka, rescued Makuta Miserix from the volcanic prison of Artidax to install him as the figurehead of the coming war against the Brotherhood. confirms that Ussal remained part of MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. civilization wherever it relocated.
Frequently asked questions
- What is an Ussal?
- The Ussal was a six-legged armored Rahi domesticated across the Matoran Universe for labor, transport, and defense. Native to both Metru Nui and Mata Nui, Ussal teams hauled cargo through Le-Metru's skyways, drove the mining shafts of Onu-Wahi, and carried Matoran riders through dark, tight tunnels.
- How were Ussal used on Mata Nui?
- After the Matoran exodus to Mata Nui, Onu-Koro maintained the deepest working relationship with the species. Ussal teams pulled carts through the tunnels of Onu-Wahi hauling protodermis and other resources, some were modified with saw-pincers for excavation, and the Ussalry operated as a corps of miners and mounted defenders.
- What were Rock Ussal?
- The Rock Ussal of Voya Nui were a regional variant adapted to the island's harsh volcanic terrain, with heavier carapaces and pincers built for cracking volcanic rock rather than hauling cargo. Unlike the mining Ussal of Onu-Wahi, they retained natural pincers shaped by their environment and needed no mechanical attachments.
- Who was Pewku?
- Pewku was the most documented Ussal in the historical record, the Ussal kept by the chronicler Takua. Pewku carried Takua across Mata Nui during his travels between villages, through tunnels, and away from Bohrok engagements.
- What inconsistencies exist in the records about Ussal?
- Several details vary across sources, including the Ussal's depicted size, which ranges from large enough to carry a Matoran rider to small enough to be mistaken for a domestic animal, with no standard measurement in any primary archive. The evolution mechanic that produces larger, stronger forms is referenced but never directly observed, and named specimens such as Pewku never display any transformation.
Gallery



Images via BIONICLE Wiki (Biosector01)
Sources
- SerialFederation of Fear โ Primary source via BS01 wiki entry
- BookBIONICLE Adventures 1: Mystery of Metru Nui โ Primary source via BS01 wiki entry
- BookBIONICLE Adventures 2: Trial by Fire โ Primary source via BS01 wiki entry
- BookBIONICLE: Encyclopedia Updated โ Primary source via BS01 wiki entry
- BookBIONICLE: Encyclopedia โ Primary source via BS01 wiki entry
- BookBIONICLE: Rahi Beasts โ Primary source via BS01 wiki entry
- VideoBIONICLE: Mask of Light โ Primary source via BS01 wiki entry
- GameMata Nui Online Game โ Primary source via BS01 wiki entry
Spotted a factual error or a primary source we missed? Email a correction. Every flagged claim gets reviewed.
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