Protosteel
The Matoran Universe's strongest metal, forged for weapons that could cut through virtually anything, even Makuta armor.

If a weapon could slice through MakutaMakuta (Species)Shadowy Antidermis beings and the Brotherhood's elite, Makuta commanded darkness and shaped the Matoran Universe's fate. armor without breaking stride, what metal would forge it? Protosteel. The Matoran UniverseMatoran UniverseA civilization of biomechanical beings living inside a colossal robot, destroyed when Teridax seized control.'s strongest metal didn't just exist as theoretical advantage. It cut through defenses that stopped everything else. Order of Mata NuiThe Order of Mata NuiThe covert organization founded by Helryx to serve the Great Spirit directly, operating in concealment from a fortress on Daxia and waging the open war against the Brotherhood of Makuta that decided the fate of the universe. operatives and front-line combatants alike built their arsenal around protosteel because no other metal even came close to its edge.
The Strongest Metal#

Protosteel holds a place unlike any other metal in the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. Universe. It wasn't just more durable than what came before. It could cut through MakutaMakuta (Species)Shadowy Antidermis beings and the Brotherhood's elite, Makuta commanded darkness and shaped the Matoran Universe's fate. armor with ease. That distinction matters. MakutaMakuta (Species)Shadowy Antidermis beings and the Brotherhood's elite, Makuta commanded darkness and shaped the Matoran Universe's fate. are beings of immense power, and their armor reflects centuries of refinement and protective enchantment. A weapon that could breach that defense was not merely sharp. It provided a capability no other weapon could match.
The metal's origins trace back to ArtakhaArtakhaArtakha was the master craftsman of the Matoran Universe, ruler of a hidden island, and the forger of the Toa Mata, the Avohkii, and the Kraahkan., the mystical island where the greatest craftspeople in the universe worked. It's unclear whether ArtakhaArtakhaArtakha was the master craftsman of the Matoran Universe, ruler of a hidden island, and the forger of the Toa Mata, the Avohkii, and the Kraahkan. forged it or discovered it, but the Order of Mata NuiThe Order of Mata NuiThe covert organization founded by Helryx to serve the Great Spirit directly, operating in concealment from a fortress on Daxia and waging the open war against the Brotherhood of Makuta that decided the fate of the universe. seized on its potential immediately. They recognized what they had: the universe's answer to unbreakable defense. Protosteel became their signature material for the most critical weapons.
Weapons and Users#
Protosteel appeared across the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. Universe in the hands of those who needed it most. 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. Mahri wielded Protosteel TalonsProtosteel TalonsToa Mahri Hahli's protosteel melee weapons, transformed from her Toa Inika Laser Harpoon and recognized as among the few tools that could break Makuta armour. that combined the metal's edge with their own elemental strength. EhlekEhlekA Barraki warlord with electrical powers who led aquatic forces against the Brotherhood of Makuta., the Barraki commander, carried Protosteel Tri-TalonsTri-TalonsEhlek's Protosteel claws, engineered by the Order of Mata Nui to pierce even Makuta armor. as signature weapons. Even Dark Hunters like LariskaLariskaDark Hunter defined by discipline and tactical competence, Lariska was one of the Shadowed One's most dependable operatives before joining Brutaka's desperate mission. trusted their daggers to protosteel when facing high-level threats.
The metal's capacity went beyond weapons. The MutranMutranMutran is a Makuta of the Brotherhood of Makuta who serves as the Makuta of Voya Nui and is among the most prolific Rahi creators within the organization. Hailing from the Southern Islands, he wears the Great Shelek and commands the powers of Shadow and Silence alongside the full range of Kraata abilities, wielding a Shadow Blade, Shadow Spear, and Tridax Pod in combat. Chronicles reveal that protosteel could be layered into armor as additional protection. MakutaMakuta (Species)Shadowy Antidermis beings and the Brotherhood's elite, Makuta commanded darkness and shaped the Matoran Universe's fate. themselves incorporated protosteel into their defenses after transitioning to new forms. Yet even protosteel had a weakness. A virus engineered to consume the metal could devour an armor coating in seconds, turning its greatest strength into vulnerability.
Compiled from primary sources by Lore Fortress editorial. Reviewed by Joe Garratt, Editor-in-Chief.
Gallery

Images via BIONICLE Wiki (Biosector01)
Sources
- SerialDestiny War — Greg Farshtey serial
- SerialFederation of Fear — Greg Farshtey serial
- SerialThe Mutran Chronicles — Greg Farshtey serial
- BookBIONICLE: Encyclopedia Updated — Official reference
- WikiProtosteel — Biosector01 entry
Spotted a factual error or a primary source we missed? Email a correction. Every flagged claim gets reviewed.
Related entries
The Order of Mata Nui
The covert organization founded by Helryx to serve the Great Spirit directly, operating in concealment from a fortress on Daxia and waging the open war against the Brotherhood of Makuta that decided the fate of the universe.
Artakha
Artakha was the master craftsman of the Matoran Universe, ruler of a hidden island, and the forger of the Toa Mata, the Avohkii, and the Kraahkan.
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Makuta (Species)
Shadowy Antidermis beings and the Brotherhood's elite, Makuta commanded darkness and shaped the Matoran Universe's fate.
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The most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body.
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Protosteel Talons
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Razor-Edged Protosteel Shield
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