Astellia means the whole universe including this world. The power of which Astellia are composed, the most basic root of energy. It is Atra that covers the whole world in the stream of constellation and stars in the sky.The good god Norden of sun and light established the order of the world by using this Atra. The evil god Karza of darkness and chaos corrupted the world by polluting this Atra and challenging the authority of Norden. Due to the battle between Norden and Karza, Astellia is contracted, expanded, changed and developed. Until now both gods have continued fighting.