Order of Mata Nui

Overview
The Order works in utmost secrecy, leaving public acts of Mata Nui's will to his chosen warriors, the Toa. Very few know about its existence:
 * Members of the Brotherhood of Makuta "probably have suspicions, but don't know about it directly."
 * Vakama knows that there is a group that serves Mata Nui.
 * Dark Hunter leader The Shadowed One is aware of a "mysterious third player" that rivals both the Hunters and the Brotherhood, and has tasked the Hunter codenamed Gatherer with finding more information.
 * In a recent fight between the Toa Inika and the Piraka, Brutaka let slip that he was "a member of the Order of Mata Nui". But it seems unlikely that anyone other than Toa Hewkii heard him in the chaos of the battle, and Hewkii refused to believe that such a menacing giant would be associated with Mata Nui.

History
The Order of Mata Nui was first formed by the Great Beings at roughly the same time as both the founding of Metru Nui and the formation of the Brotherhood of Makuta. It was formed as a secret society dedicated to serving the will of the Great Sprit Mata Nui. It is one of three major organizations in the Bionicle universe, the other two being the corrupt Brotherhood of Makuta and a mercenary guild called the Dark Hunters.

Members

 * Axonn
 * Brutaka
 * Botar
 * A member killed by the plant Karzhani.
 * A member killed by Makuta on the island of Mata Nui. Vezon later used his canister to go to Voya Nui.
 * Umbra