Shadows of the Horizon

The Shadows of the Horizon are a group of extremely powerful extra-dimensional entities residing within the Abyss. They are currently regarded as the main antagonistic force in the Quest of Thressos canon.

History
The origins of the Shadows are never fully explained, but it can be inferred that they are at least as old as the Prime Plane, likely even older. It his hinted several times that the Shadows of the Horizon somehow helped provide the Four Gods with their godly powers, as well as having some sort of link to the ascension to godhood of both Iskra and The False Gods.

They reside in the Abyss and are seemingly unable to willingly enter the Prime Plane, requiring complex rituals in order to be allowed through.