Infects visitors with an incurable wasting disease. 5- Wormblood: Contested by multiple demon lords.4-the Grand Abyss: A dangerous realm of ancient portals to other layers atop an infinitely deep chasm.3-the Forgotten Land: Ruled by the demon lord Zzyczesiya, the Ungrasped.Inhabited by massive hives of constantly warring insects. 2- Driller's Hives: Ruled by the demon lord Tharzax, the Chattering Prince.It is also called the Palace of 1,001 Closets. It is a dusty wasteland dotted with iron fortresses and pits leading to deeper layers. It connects to the plane of the Outlands via a town of Plague-Mort, and can also be accessed by the River Styx. One of the best-known layers, it is the only layer coterminous with the Astral Plane. 1- Pazunia, the Plain of Infinite Portals: The top layer of the Abyss.While historically it was believed that there were precisely 666 layers of the Abyss, it is plausible that there may be even deeper and more inhospitable layers which no human has ever successfully explored and returned to tell the tale.
In practice, worlds with physical connections tend to have adjacent numbers, and realms with a higher number are more distant from the first layer and thus harder to reach. The numbering system used was developed by the Fraternity of Order, a guild of planar explorers who simply numbered the layers in the order they were discovered. Controlling at least one level of the Abyss usually qualifies a demon to claim the rank of demon lord. Each has its own unique and terrible terrain. The Abyss is unique in that it is divided into an uncountable number of independent planes.
It is chaotic evil in alignment, and best known as the home of demons, including the numerous varieties of tanar'ri. The Abyss, also known as The Infinite Layers of the Abyss, or Demonholme, is one of the planes of existence in Dungeons & Dragons.