Kraahkan (Spherus Imperus)

The Mythical (Mask Rarity) Mask of Shadow, numbering only four in the entirety of the Spherus Imperus reality, which gave its user immense power over the element of shadow.

History
The Kraahkan's origins are totally unknown, with even Teridax (Spherus Imperus) possessing only educated guesses as to it's creation. Teridax first located the mask in the centre of a dwarf star he had been transported to by an encounter with a Master of the Multiverse. Protected by the Master's influence, he took the mask, and placed it upon his head. Instantly, his powers were magnified by several thousand times, and the purity of the mask's shadowy energies granted him utter dominance over the element of shadow.

Since then, the mask has been synonymous with Teridax himself; the mask having been a symbol of his power and abilities for as long as Teridax has been known to the Toa Confederacy. The mask was the only one in existence, until Teridax experimented with creating three replicas to outfit more Makuta with, in order to create an unstoppable army. These masks were but a fraction of the pure Kraahkan's power, and each one carried a defect; Cazzadath's mask crippled him physically due to the onslaught of shadowy energy, Narthion's accidentally inherited half of its energy from light and thus made the wearer undergo a dramatic personality shift to become more merciful and moral, and Visstass's mutated him to become incredibly slimy and like a leech in appearance, outside of his armour.

Teridax wears the mask to this day, and the replicas remain with their chosen wearers. It is thought that, given the Kraahkan's Mythical status on the Kanohi Power Spectrum (Spherus Imperus), its destruction could remove from existence all beings possessing any power over the element of shadow, and would totally remove all shadow energy from the universe.

Powers
The Kraahkan was Mythical for a reason; the bolts of pure shadow fired from the mask alone could devastate even the most stalwart of defenders, and any wearer would quickly find their very being totally dominated by the shadowy energies emanated from the mask. Any being capable of exerting influence over the mask would find their powers magnified many thousands-fold, and would make them a nigh-unmatched being of elemental dominance, besides wearers of other Mythical masks.