Sin Eaters

Abominations formed from the souls of deceased Mortals, transformed by the miasma of the Sealed Realm. They range from small minor creatures, to larger, more dangerous ones. Sin Eaters consume the souls of living beings, transforming them into more Sin Eaters. They primarily exist within the Sealed Realm, though some minor Sin eaters have escaped into the overworld. Mortals have dubbed them the Voidsent.

Creation of Sin Eaters
Sin Eaters primarily started to exist due to the miasma transforming the departed souls of deceased Mortals. These souls were intended to travel to the Sealed Realm as a last destination after the death of their mortal bodies, to rest at the Spring of Rebirth, but the miasma absorbed and warped their souls into unrecognizable forms, turning them into empty vessels, embodiments of the abyssal void. This emptiness causes them to seek to fill that void by consuming souls, however, no matter how many souls they consume, their bastardized bodies will never hold their own souls again — thus they eternally consume and destroy, until there is nothing left to consume, in which they are simply left with their agony and nothing else.

When a Sin Eater consumes the soul of another living being in the Sealed Realm, that being will also be transformed by the miasma into a Sin Eater. As the only other living beings in the sealed realm are Eidolons, they are the ones who's souls are being consumed. When an Eidolon is transformed, they become a more humanoid-looking Sin Eater, and seem to retain some of their memories, being able to speak short sentences and recognize faces and places, though they, too, are consumed by the never-ceasing agony of seeking for a soul to fill the void in their bodies. Sin Eaters formed from Eidolons are much more powerful, and are capable of using Voidal magic. It is thought that they are the ones orchestrating the direct, organized attacks on The Sanctum.

Due to the requirement for the Sealed Realm's miasma to be present in the creation of Sin Eaters, the ones who have escaped to the overworld cannot create more Sin Eaters while in the overworld. When a Sin Eater consumes the soul of a being in the overworld, the being simply dies, its soul perishing and its body decaying immediately.

The form a Sin Eater takes, and whether that form is strong or weak, is determined the by the original's souls desires and ambitions during its original life. Souls that had strong desires become strong Sin Eaters, and souls that had little ambition or no desires, or who were fulfilled in life, become weak Sin Eaters. The only exception to this is Sin Eaters formed from Eidolons, which are almost always very strong. The form of a Sin Eater is also directly influenced by the type of desires and ambitions of the original soul; this affects its shape and colour, and what abilities it may exhibit.

Denominations of Sin Eaters
Minor - small and weak Sin Eaters that don't have many special abilities. Despite this, they are still not easy to kill. Their forms are not very unique, and there are many with similar or even identical forms. Mostly grey, black, and deep purples, with mottled or lumpy compositions. Some have wings or legs, or vaguely animalistic features.

Major - larger and stronger Sin Eaters that have a range of powerful abilities, and more unique and clearly defined forms. Many are white or grey with smooth, gooey, or feathery composotions, and bizarre, unique shapes. Some stronger ones have stark splotches of bright colours like red and orange on them, though this is uncommon.

Immortalic - Sin Eaters created from transformed Eidolons. Extremely strong, none have been yet been defeated. Take on somewhat humanoid forms, as though their bodies resisted corruption in some places. Most have minimal speech capabilities and can seem to recall familiar people and places, but retain no aspects of their personalities or living qualities, reduced to a zombie-like state that only seeks to consume. Seem to be organizing and leading the lesser Sin Eaters.