Abyssos

The Abyssos, also known as the Ancient Abyss, Godsblood, or the Primordial Depths, is a sea formed by the blood of all the Aidrus and Eah during the Primitus Age, which pooled below the Monumidium. During this time, before the formation of Ebdypha and the Old Sea, the Abyssos was vast and deep, and gave birth to such powerful creatures as Ebdahat, but the Abyssos was pushed further and further down over time, and is now considered unreachable, though occasionally some of the Abyssians find their way to the surface.

The Abyssal Custodians believe that there is a second sun in or near the Abyssos called the Undersun, but all major religions reject the Undersun's existence.