Arthron

"Jaller tried using his mask to dodge the chunks, only to find that he was suddenly hearing sounds bouncing off nearby objects."

- Narrator, Prisoners of the Pit

The Kanohi Arthron is the Mask of Sonar. It allows its user to sense the movement and positions of targets through echolocation. The wearer can also use this mask to examine their surroundings in darkness. This mask is one of the few that can detect an invisible target (like a Kanohi Huna-user). As with real sonar, it identifies the general shape and movement of its target, but does not provide details. A Kanohi Arthron is always on at a low level.

Example Usage
Jaller's Mask of Sonar detected the Piraka in the Cord, but he was unable to recognize them until they attacked in Downfall.

Great

 * Toa Mahri Jaller - Primary mask.
 * Toa Neţeru Nebt-het - Primary mask.

Matoran

 * Kraahua - Formerly (Deceased
 * Nebt-het - Formerly; became Great when she transformed into a Toa Neţeru.