Underworld

The Underworld is a dark and malevolent plane consisting of three separate realms: Hell, the Abyss, and Abaddon. These planes are encased by the River of Blood, a boundary that marks the transition from the Astral Sea to the domains of pure evil. Each plane embodies a different aspect of evil and serves as the final destination for souls aligned with their respective moralities.

Geography

River of Blood

Encasing the underworld is the river of blood, a dark and ominous river that acts as a barrier between the three realms. It is filled with the souls of slain fiends—demons, devils, and daemons—who wander aimlessly for eternity. The river is an endless ocean of red ichor, said to have been bled from Satan after being struck down by God. The River of Blood is so necrotic and vile that no living entities except fiends and gods can survive contact with it.

Hell

Hell, also known as the Nine Hells, is a realm of law and order twisted by malice and cruelty. It is a place where lawful evil souls are reborn as devils. The plane is ruled by the archdevils, with the supreme ruler being Asmodeus. Hell is a meticulously organized and hierarchically structured place, where each layer is more oppressive and torturous than the last. Lawful evil mortals are reborn as devils in the hells, continuing their existence in service to the archdevils and perpetuating the cycle of oppression and tyranny.

The Abyss

The abyss is a chaotic and nightmarish realm, home to the chaotic evil souls who are reborn as demons. It is a place of constant turmoil and destruction, where the landscape shifts and warps unpredictably. The abyss is ruled by several powerful demon lords, but ultimate control lies with Malroth. The demons of the abyss are chaotic beings driven by pure malice and destruction. Chaotic evil mortals are reborn as demons, embodying the endless chaos and malevolence of the plane. The realm is in a constant state of war and upheaval, with demons battling each other for power and territory.

Abaddon

Abaddon is a realm of desolation and despair, where neutral evil souls manifest as daemons. It is a bleak and barren place, governed by many evil deities including Goruk, Kormaush, Ogmauth, and Xevila. The ultimate rulers of abaddon are the Four Horsemen of the Apocalypse: Illithor, Zu’Gara, Dukaath, and Akathis. The daemons inhabiting abaddon embody the purest form of malevolence and corruption. Neutral evil mortals are reborn as daemons, existing to spread misery and decay. The realm is a place of suffering and hopelessness, reflecting the dark natures of its inhabitants.