A long time ago, in the distant past...
Humans lived peacefully on the fertile lands between the sea and the sky.
One day, they built a Mana Machine, capable of harvesting the power of the spirits that flowed through the lands. It would bring them prosperity.

However, there would come a day for the sun to set eternally.
A toxin called Odium crept its way out from the depths of the earth and poisoned every living thing on the planet, including countless animals and the once beautiful nature.
The lands had lost their spirit power, and the people who were so dependent on this Mana were brought down to their knees, facing the brink of their doom.

It was then that Themis, a most kind deity, commanded four spirits to find land that was not stained by Odium, lift it off the ground, and set it afloat. People were spared from the threat of Odium.

These spirits, who had expended all their power, changed their forms into gems called "Artifacts" in order to prepare for the day they were needed once again.
They have been in a deep slumber ever since.

This holy land, saved by the Artifacts,
now soars the open sky.
The people adjusted to life there,
and would eventually name their new home...
Skyworld Shelterra.