Fenaltak

Mythical mask of Creation, owned and forged by Artahka (Spherus Imperus), and currently missing, along with the Llyown.

History
The Fenaltak was first created and forged by a Great Being named Angonce, who was really a Master of the Multiverse in disguise, and had been a close friend of Heremus. Angonce decided it would make Heremus' work of creating a bio-mechanical life-form easier if he had the capacity to create components from his own mind without having to manually construct them. However, the invasion of the Demonkin prevented Heremus from finishing his plans for widespread creation of them. Angonce sacrificed his power, like one other Great Being, and took the alias of Artahka in order to help the biological life the Great Beings had succeeded in making survive.

The Fenaltak was used primarily by Artahka in order to help with the construction of the building blocks of Spherian society. He also created the Llyown for the same purpose. Eventually, Artahka finished constructing the initial settlements and left the Spherians to their business. He created his own paradise, and used his considerable leftover powers to redirect the elemental energy of the dead into his paradise, allowing them to reunite with the energy of the planet and essentially become reincarnated as new elemental strength in a new Matoran. The Fenaltak was crucial to this as it served as a beacon for the energy to be transferred towards. The Fenaltak was weakened in power following Artahka's finishing of his plans, as it no longer served a distinct purpose and thus its creation energies leaked out into Artahka's paradise, creating a land that constantly shaped and sculpted itself. Artahka showed no intention of returning the Fenaltak to its full power, as he speculated it could have been used to create entirely new biological life, and he would not want that power to be available to anyone, not even himself.

However, when Teridax led his conquest using the Kraahkan and attempted to destroy the Toa Confederacy, elevating himself to a Master of the Multiverse, Artahka came out of his paradise and lent his aid to the Toa Confederacy by supplying the materials necessary for the war effort, and promising to use his own powers against the Makuta. In the final confrontation with Teridax, Artahka was critically struck by a blow from one of four Makuta he had been tackling single-handed, and he teleported himself back to his paradise. He took the Fenaltak and the Llyown with him, and it is unknown whether or not he still lives. What is known is that the Mask of Creation must be intact, else theories regarding the properties of Mythical (Mask Rarity) masks would be entirely incorrect.

Powers
The Fenaltak was capable of creating any object the creator could envision in their own mind, or that they possessed blueprints to-it could not be used to create objects that the user had no understanding of, either internally or externally, but the only known user of the mask, Artahka, possessed such advanced knowledge of the building blocks of Spherian society that he could construct nearly any known object, tool, or material from his mind without blueprints.

The Mask of Creation could also be used to mend damage to objects, provided one knew the extent of the damage on that object. It is thought that, like all Mythical masks, it possesses a clear connection to the fundamental concepts of the universe and, as a consequence, if it were destroyed, it is entirely possible all knowledge on objects, tools, and structures either created or perpetuated by the mask, as well as entire chunks of reality, would cease to exist altogether.