The Outer Rifts, also known as the Abyss, is a plane in the Outer Sphere dedicated to the rule of evil unfettered by law. It is accessible through huge rents in the Maelstrom, opening into fiendish depths vast beyond imagining. Demonic occupants of the Outer Rifts sporadically pour from these rents to menace one plane or another, and sometimes even tear their way into the Universe. The Outer Rifts have many layers, many of which are ruled by powerful and unique demon lords or deities.

See: Outer Rifts