Undersun

The Undersun is an alleged second sun which exists somewhere in or near the Abyssos. Most theories of Ayu reject the idea of the Undersun as it has no known origin in any of the major religions, histories, or myths, yet it is a central concept to the Abyssal Custodians, as it represents their desire to replace the New Sea with the Abyssos and eventually raise the Undersun up from underground. It is said that Bloodlights shine with the glow of the Undersun.