Infinite in evil, cruelty, and bloody war, the Abyss stands unequaled among the planes as a place where betrayal, treachery, and murder are teh approved ways to greet hapless travelers. All purity is corrupted here and all dreams die. The despairing lower ranks are at the mercy of the greater fiends, and the high-ups have no mercy. If it talks, the tanar'ri cheat it, and if it moves, they kill it. Int the Abyss, a berk's either quick or he's dead. Better be ready.
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Isle of the Dead
Zanzibar's Lair
Archives
Shade's Den
Story of Demonslayer
Layers of the Abyss.