A subgenre of cosmic horror centered on the nature of being itself—triggered when mortals or gods encounter an entity or phenomenon and cannot determine what kind of
thing it fundamentally is. Rather than fitting neatly into familiar categories
like "
person," "location," "object," or "natural process," the anomaly exhibits traits of all
four simultaneously or shifts between them depending on how it is perceived. In the Abzuverse, the primordial
Abyss embodies this terror: it acts at once as an infinite ocean, a conscious sovereign, a metaphysical boundary, and the origin of entropy. Whether encountering a temple that turns out to be a living process or a deity whose memories are distributed across an entire realm, Ontological Cosmic Horror shatters the
basic mental boundaries used to tell people, places, and things apart.
