Aevi

Aevi is a term used in speculative fiction and related media to denote a primordial or otherworldly aspect of reality. In various works, the Aevi can function as a source of power, a hidden dimension, or a race of ancient beings that predate the known universe. The concept is often employed to explore themes of time, creation, and cosmic order, with the Aevi acting as guardians, influencers of fate, or catalysts within a story's arc.

The name is commonly linked to the Latin aevi, derived from aevum meaning "age" or "lifetime," and is chosen for its connotations of antiquity and timelessness.

Variants include a timeless energy field that interfaces with matter; a hidden dimension that bleeds into the material world during crises; or an elder race whose members accumulate knowledge and power over eons.

Because Aevi is used differently across settings, there is no single canonical definition. Related concepts include aether, cosmic energy, and primordial beings.