Blood Rift

The Blood Rift is named for the rift that the River of Blood creates crossing the plane. It serves as the main connection between the Nine Hells and the Abyss, so it is the main battlefield for the Blood War. In addition, it sometimes connects to other lower planes, bringing the eternal struggle there, until it floats away or a deity takes action to stop the carnage.

The Blood Rift is very similar to the Barrens of Doom and Despair, with empty plains and rocky badlands, perfect for ambushes and treachery.

Some time during the Hundred Years of Chaos it was revealed that yugoloths were demons and the Blood Rift was folded into the Abyss.