There exists a multitude of worlds. Each with their own types of power structure. The worlds which are groomed to support the power structure they have. The reincarnation of souls to these worlds are not simple. Just before the reincarnation, the souls get a set of points with which they can decide their talents and characterstics. But sadly these souls have no memory but just their core charaterstics, hence they select instinctually rather than planned. The Eternals are the souls which have gained enough power to break free from reincarnation and possess immeasurable power. Eternal was a diabolical Eternal whose notorious deeds made even the self-proclaimed Gods tremble. Erwin, when crumbling down to nothingness during a chaotic war, saves the last bit of his soul and binds it to a soul system that he had created as a failsafe and sends the soul to reincarnation. This tale is not about Erwin. It is about Arthur. The one the soul reincarnates into.