Long ago, this planet had no alteration of Xer.
No supernatural events. Just common folk walking on the ground.
One day, that changed. Under the blue sky, plants began to change. They grew taller and developed different colors. Then came the animals. Some grew bigger, fiercer, and stronger, and gained elemental powers.
Humans were a weak species even before the transformation. All they had was their trust in their weapons, but now those weapons were useless.
This also changed human society. As the creatures outside became more dangerous, the city walls were reinforced and upgraded to protect those living inside. The poorer ones, however, were thrown out beyond the walls.
Those who were thrown out mutated into Xernians.
Some feared them, some hated them, and some called them a blasphemy. Fleeing from that civilization, they founded various Base Camps where they could live normally.
That was considered Year 0 of Athea, based on the research of the Xernians known as Zepher.
It was a new world. A new era.
124 years later, a strange phenomenon appeared in the middle of the sky...