The continent known as Caskaris, which is situated to the northwest of the central world of Arethayn, found itself and its inhabitants to be in a state of constant flux as owed to the curse of darkness such that time would flow cyclically between extremes in an eternal change. From this phenomenon of phase and transition was born the reverence of the inhabitants of Caskaris for a dualism, a natural inclination that the world was composed and given rise to by two essential and primordial beings rather than being shaped by merely one. Thus was born the broader Iluayanic and Varayanic perspective of duality and a juxtaposition between opposites, a natural inclination to acknowledge the faculties of a being as being limited and constrained by the ability and potential of the other. Then, it was understood that neither essential force and inclination was truly good nor evil, and instead, they each comprised only the capacity for which the other could not possess. Thus, they were understood as two parts of a whole and fully realized capability, and though they were not united into a quintessential singularity, they were thought to have been in the primordial age. Though the primordial powers of duality are recognized as disparate in function and ability, Caskaris is thought to have been born from the intersection between the two, and thus, Caskaris possesses both aspects of the light and the the dark.

The Iluayans, who are the most plentiful and abundant of the peoples of Caskaris, largely reside in the changing and twisting forests of eastern Caskaris, called the Ayosic Forest that happens to be to the south of the Aryelic Mountains, a mountain which the city of Aryela was notably built into through a feat of engineering. In this region of southeastern Caskaris, there exists a plentitude of flora and fauna, and many alchemical ingredients may be procured from foraging through the forests. Though the forest is densely overgrown in a thicket of plant matter, many of the kingdom of Ayoskova have attempted to lay down paths and roads so that the people might better navigate through the forest in travel from one Ayoskovic city to the next. In the forest, there exists a wildness that is distasteful to the Ayoskovic royal family, and so, while they do not journey to the southern coast of Caskaris, they have employed scouts in order to develop a report on the peoples who belong to that region. Notably, some of these people identify under the cult of Aethericism, and it is the religious customs and practices that this group professes which the Ayoskovic kingdom has outlawed. The southern coasts, then, while belonging to the broader region of the Ayosic Forest, have often their own inhabitants and peoples, a circumstance only made possible through the density of this forest.