"Jaller tried using his mask to dodge the chunks, only to find that he was suddenly hearing sounds bouncing off nearby objects."
— Jaller's use of the Arthron, BIONICLE Legends 7: Prisoners of the Pit
Mask of Sonar
Notable Wearer(s)Jaller
The Kanohi Arthron was the mask of "Sonar". The mask allowed its user a basic level of control over echolocation, which allowed a Arthron-bearer to locate objects through use of sonar waves.
Additionally, the Arthron would allow a wearer to sense the presence of a concealed target - such as an Iden or Huna wearer.
Comic Arthron

Furthermore, a Great Arthron would constantly be active, allowing its bearer to subconsciously detect nearby objects or targets.

Example Usage

Jaller's Mask of Sonar sense the presense of the Piraka in the Stone Cord. However, could not recognize them until they attacked the Toa in BIONICLE Legends 8: Downfall.

Known Wearers



  • A standard Great Kanohi Arthron is constantly on at a low-level, allowing its bearer to subconsciously detect nearby objects or targets.
  • The Arthron is considered to be a less powerful version of the Kanohi Elda.
VahiIgnikaMask of Creation


PehkuiMask of ClairvoyanceKualsiMask of EmulationMask of GrowthMask of Rahi Control
JutlinAvsaFelnasMohtrek ShelekCrast
Other: Golden KanohiInfected KanohiCopper Mask of Victory
Mask of Elemental EnergyAvohkiiKraahkan
Mask of Light and ShadowKirilRodeOlmakOlisi
Mask of IntangibilityMask of Possibilities
Mask of PsychometryMask of MutationMask of Charisma
Mask of AdaptationMask of AgingMask of BiomechanicsMask of ConjuringMask of FusionMask of IncomprehensionMask of ReboundingMask of Sensory AptitudeMask of ScavengingMask of Undeath

Kanohi Nuva:

Hau NuvaKaukau NuvaMiru NuvaKakama NuvaPakari NuvaAkaku NuvaAki NuvaRua Nuva

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