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Acheron was an Outer Plane in the Great Wheel cosmology model representing alignments between lawful evil and lawful neutral with emphasis on law. Some characteristics of this plane were ascribed to the World Tree cosmology planes of Clangor, Nishrek, and Warrior's Rest when that cosmology became popular. Nishrek and Warrior's Rest survived the Spellplague and became part of the World Axis cosmology model.

Description
Acheron was the bridge between the ultimate order of Nirvana and the regimented evil of the Nine Hells and as such, each layer emphasized order over evil. The land masses on each layer were blocks of geometric simplicity the size of nations floating in a sea of air. The blocks would slowly collide and part without causing any upheaval or tremor, allowing beings to move to a new block if desired. The dance of the blocks was carefully orchestrated and creatures of high intelligence could usually discern a pattern for an area by studying the motions. It was said gravity pulled toward the center of the blocks but in practical terms gravity was normal to each surface.

Avalas
Acheron was sometimes known as the "iron-shod battle planes of Acheron" due to the characteristics of the first layer, Avalas. The blocks of the top plane were black with a metallic hardness that allowed the sounds of battle and troop movements to reverberate loudly. Avalas had the most block-like worlds and the highest population as the armies of the Outer Planes spent their afterlife clashing in neutral territory over differences both subtle and gross. The landscape consisted of cone-shaped mountains and pits plus the iron fortresses of the various armies. The only other remarkable feature of this layer was the river Styx that would bubble up from one pit, meander across two or three sides of a block, and then disappear down another pit. The Styx did not visit all the blocks, but those it did could be reached by Charon and his servants.

Avalas touched the Astral Plane and had spherical portals to the three adjacent planes: Nirvana, the Nine Hells, and Concordant Opposition. The portals hung at fixed locations in space and would pass harmlessly through the blocks, becoming inactive while inside a block and reactivating when they reappeared. Anyone emerging from a portal would start to fall toward the nearest block and almost certainly required some form of flight to avoid a high velocity impact. The portals were activated by touch and the destination could be determined by the sound it made when activated. A harmonious chord indicated a portal to Nirvana, a dissonant chord meant the Nine Hells, and silence indicated Concordant Opposition.