Dark Area

The Dark Area (ダークエリア) is a jet-black, abyssal "graveyard of deleted data" full of evil energies governed by Plutomon, and located within a spatial distortion of the Digital World, below the Net Ocean. How it came to be within the Digital World is a mystery whose secrets are known to be held by GranDracmon, although it protects them well.

First and foremost, the Dark Area is the place to which Digimon are ultimately transmitted when their life span finishes or they are defeated in battle, and is guarded and supervised by Anubimon, who constantly surveys the arriving data; if their data is good, it will reset them back to a, but if they are evil, it imprisons them within the eternal darkness.

However, the chief nobility of the Dark Area, the Seven Great Demon Lords, are able to subvert this process, as their victims' data is instead sent to the heart of the Dark Area to become their flesh and blood. Furthermore, after the ancient failed rebellion of the Demon Lord, Devil, and Fallen Angel Digimon against the creator of the Digital World, led by Lucemon and Daemon, the evil Digimon were imprisoned in the Dark Area along with many of the other Demon Lord Digimon. Other Angel Digimon who rebel and fall from grace also end up imprisoned within the Dark Area, where they become Demon Lord or Fallen Angel Digimon,  and may be inscribed with the Mark of Evil as proof.

As a result of these two processes, the Dark Area is primarily inhabited by Fallen Angel Digimon and their like, although it also contains Dark-species Digimon who are thought to descend from Vilemon, as well as species who have fled the Digital World proper after being driven near to extinction. Due to the violence of the Dark Area, most of the indigenous Digimon have made brutal adaptations in order to stay alive, although some are merely exceedingly mischievous.

At the very heart of the Dark Area is a den of demonic Digimon, led by the nobility of the Dark Area, and also where several of the Seven Great Demon Lords reside or are sealed. Most of the nobility lead legions of the dark army of demons known as the "Nightmare Soldiers". However, the authority of the Seven Great Demon Lords is not absolute throughout the Dark Area, as GranDracmon has kept a castle within it since ancient times, and is powerful enough that it need not submit to them. The Dark Area is also covered by the vast, dark "Evil Forest" (エビルフォレスト).

Despite its purpose as a prison for evil Digimon, the walls are not sound. The messenger of darkness Devimon was able to summon the supremely evil Devidramon to the Digital World from the Dark Area, while the evil Bakemon and Gulfmon were both born from the prison itself. Conversely, some Digimon are able to cast their victims into the Dark Area through a "Hell Gate" (地獄の門) or "Maw" (口), and it is said that those who attempt to reach the Golden Land but fail Yatagaramon and Crowmon's "Threefold Trails" are dispatched to the Dark Area as well. Some of the Demon Lords are even able to directly channel the realm's evil energies in battle as extremely high-temperature blasts.

Digimon Frontier
The Dark Area in Digimon Frontier is a location that lies at the center of the. It is where the primordial chaos and the world's corrupt souls gather, and the tyrant was sealed here by the  after his defeat. Within the Dark Area, Lucemon plots his revival by tasking his servants—first, a corrupted, and second, the wayward —to gather the world's data for him. As he attains more and more power, the Dark Area constrains him less and less until he is able to spread his power into the world itself, and with the scanning of the entire world, Lucemon himself is finally freed from his prison. After digivolving to his, Lucemon heads to the Dark Area and uses its power to form a tunnel to the Human World. The force one final battle here, where  saves his friends at the cost of his soul, which is scanned by Lucemon. The DigiDestined assume their strongest form,, due to Koichi's sacrifice. Susanoomon defeats Lucemon, bisecting both him and the Dark Area. The Dark Area appears to be purified, but its power is instead drained into the dark half of Lucemon's data, birthing, whose "Gehenna" orb is a miniature manifestation of the Dark Area.