Long ago in a time that were ruled by the Gods. The Gods battled the evil Makuta.
A long and fierce battle raged for untold time.
In the end Makuta was defeated, but the Gods of the elements payed the ultimate price with their physical forms crumbling and their bodies decaying.
Yet a final gift was given to those that now inhabit the island. These blocks of power, when infused with a suitable host, grant the bearer a fragment of the elemental power that the Gods once possessed.
New heroes came to defend the island and time and time again the power of the Gods was put into action. The great Crafters - the first Toa, crafted great weaponry, armor and equipment said to be made directly from the protodermis of the Gods fallen bodies.
Indestructible. Kept safe.
For the next generation of heroes when such a need was to arise.
Using ancient magic, the Canister's minds measure the worth of a hero, and should a host be presented for the canister to be found... the Canister will open and a new Toa will be born.
End of script
Feed back would be nice.
Edited spelling and grammar. Really lovin' the aesthetic - Waj