The Forgotten Realms [Fan Version]

Layer 111, the Mind of Evil, within the chaotic Abyss, is a sentient, insane vortex, a fusion of the demon lord Sch'thrruppasstt and the very plane itself. The Serpent Reborn, possibly the yuan-ti creator, attempted planar merging for ultimate power, resulting in a living, indestructible dimension. Magic is nullified, and the layer's terrain and inhabitants are dictated by Sch'thrruppasstt's madness. A fragment of his psyche reforms after 111 days if destroyed elsewhere, making him near-impossible to permanently eliminate. This layer, a chaotic whirlwind of insanity, is avoided by planar travelers due to its inherent danger and the complete lack of stability. The Abyss, a realm of infinite, shifting layers, is a chaotic evil plane filled with varied, hostile landscapes, each ruled by powerful demonic entities. The river Styx connects these layers, and portals lead to other fiendish planes, making the Abyss a realm of constant flux and danger.

The terrain is a swirling mass of colors and shapes, with jagged cliffs, floating islands, and rivers of dark, viscous liquid. The air is thick with a palpable sense of dread, and the sky is a chaotic tapestry of shifting hues, often filled with the echoes of tortured screams.