Axonn was a member of the Order of Mata Nui.
Brutaka was once Axonn's best friend. Immensely powerful, Axonn was a champion of justice long before the first Toa ever came to be. He watched in sorrow and anger as the Piraka seized control of Voya Nui and vowed to fight their efforts to steal the Mask of Life. Axonn wore the Kanohi Roden [sic, Rode], the Great Mask of Truth. His enormous axe could cleave a mountain in half, as well as fire pure energy from its tip. The true extent and origin of his powers remained a mystery.
Axonn was at one time a member of the Hand of Artakha. After the Hand was disbanded, Axonn wandered for some time, using his powers for petty conquests. Eventually the Order of Mata Nui recruited him, offering to put his skills to good use. Axonn was assigned to Voya Nui to safeguard the Mask of Life, partnered with Brutaka. Axonn and Brutaka defeated a number of enemies who attempted to claim the Mask of Life.
Axonn was present when Voya Nui broke off from the southern continent and shot through the roof of the Matoran universe, surfacing in the ocean waters above. When the Piraka arrived on the island, Brutaka betrayed Axonn and aligned with Piraka. Axonn eventually defeated Brutaka in battle, destroying the antidermis vat in the Piraka's stronghold. Axonn later opened a passage into the cord leading to Mahri Nui for the Toa Inika.
Axonn wore the Kanohi Rode, the Great Mask of Truth. His axe could fire energy blasts and cleave virtually any substance. In addition, Axonn had massive strength and a number of special powers, among them the ability to heal insanity with a touch of his hand.
Axonn could provide illumination by sending energy through his axe.
Axonn's mind was well-shielded against mental attack.
Axonn and Brutaka were members of the Order of Mata Nui and long-time friends. Axonn started out as a member of the Order's predecessor, the Hand of Artakha. He served with the Hand until it broke up. Both Axonn and Brutaka had enormous power. Axonn wore the Kanohi Rode, the Mask of Truth, and carried an axe.
Axonn was immune to antidermis.
Axonn wore a Great Mask.
Axonn was quite a bit taller than a Toa.
Axonn was probably about nine feet (2 bio) tall.
Axonn was more powerful than a Toa and not enormously less powerful than a Makuta.
Axonn was not stronger than a Makuta.
Axonn was stronger than Keetongu.
Axonn and Brutaka were about equal in strength.
Axonn would probably have a similar reaction to a Toa if his mask was removed.
If Axonn lost his mask, he would lose access to its power but would likely not be weakened in the same way a Toa would be.
Axonn and Brutaka were equally smart.
Axonn was likely a bit stronger than Brutaka, but Brutaka had advantages in height and reach.
Axonn and Brutaka were more powerful than the Shadowed One. The two of them were close to the power level of a Makuta, but slightly less powerful.
Axonn's weapon had no name beyond "Giant Axe".
Axonn's axe could deflect vision powers.
Axonn's ability to recall his axe was a power of the axe and its special connection with him.
Axonn had the special ability to have his weapon always return to him after being thrown.
Axonn's power to carve into stone was his own, not his axe's.
Axonn and Brutaka were the first line of defense for the Kanohi Ignika.
Axonn was likely a member of a species with a homeland.
Axonn and Brutaka were of different species and different backgrounds.