Abyss

Biodata

Feature	Details
Name	Abyss (深渊)
Alias(es)	Bottomless Abyss
Classification	Lower plane; an overarching world composed of countless Abyssal worlds/layers 69 710
Inhabitants	Abyssal demons, fallen races, and other beings drawn into or corrupted by the Abyss 295 302
Status	Extant
First Appearance	Chapter 23 (as the Bottomless Abyss) 23

Cosmology

The Bottomless Abyss consists of innumerable Abyssal worlds, each an enormous plane in its own right. Its total number of layers cannot be reliably mapped: routes between worlds shift, and previously charted worlds may vanish from their known locations. 69 683

Later accounts describe the Bottomless Abyss as a single, vast world, with individual Abyssal plane-worlds functioning as its branches. Its scale is immense enough to accommodate the true bodies of seventh-rank beings. 710 767

Structure	Description
Bottomless Abyss	The overarching lower-plane world and source of Abyssal power. 710
Abyssal world / layer	A plane-sized branch of the Abyss, often ruled or contested by powerful demons. 69 710
Abyssal Will	The will associated with the Abyss and its worlds; grants favor, rules, and authority to demons that further its interests. 502 545
Sea of Rules	A source of rule power opened to demons during major conquests and conflicts. 580

Environment

Abyssal worlds are high-magic lower planes whose conditions are hostile even by planar standards. Dense magical power supports demonic growth, while violent terrain and weather make survival precarious. 295 296

• Many layers are defined by extreme cold, blazing heat, toxic mists, deep oceans, volcanoes, lava fields, or sulfurous air. 295 297 302
• Even minor caves can contain magical power denser than Isata's heavily enhanced environment. 296
• Demons can survive by absorbing Abyssal magic power, though it is slower than feeding on other resources. 77
• The Styx runs through Abyssal worlds and may connect different layers; in Charles's world, it emerges and exits through separate ends of the plane. 685
• A world can be dragged into the Abyss, corrupted, and incorporated into its lower-plane ecosystem. 295 706

Inhabitants and Society

Demons

Demons are native to the Abyss and are described as powerful creatures whose strength can rival wizards of the same rank. Their society is shaped by predation, bloodline evolution, and the constant threat of stronger demons. 23 77

• Most demons begin as Demon Worms and may evolve through successive forms and ranks. 77
• Demon bloodlines can mutate during advancement, allowing weaker species to develop into more powerful demonic forms. 77 303
• Demons commonly kill rivals to consume their flesh, souls, heart cores, and bloodline power. 77 545
• Pain, despair, souls, demon hearts, and blood essence are all usable resources. 296 297
• Although demons are chaotic and frequently betray one another, they can form armies, settlements, and territorial hierarchies under powerful rulers. 302 509 681

Settlements and Trade

Trade exists despite the Abyss's brutality. Demon settlements are usually crude stone settlements built around a powerful ruler, while larger cities may belong to demon grand lords or fallen races. 302

• Soul shards serve as a basic demon currency. 302
• Resources may be acquired through mining, hunting, trade, slavery, or stripping them from defeated demons. 302 525
• Materials from other planes command steep prices in the Abyss because transportation is dangerous and difficult. 305 307 605
• Abyssal materials such as Abyssal Demonic Iron, sulfur crystals, blood-veined stone, Abyssal crystals, and Chaos Shale are products of its high-magic environment. 303
• Demons use Abyssal Demonic Iron to strengthen their bones and scales, though Charles considers this crude compared with industrial smelting. 679

Abyssal Will and Authority

The Abyss rewards those who expand its influence, kill its enemies, or bring it souls. Its favor can make cultivation, bloodline modification, research, and rule analysis easier. 502 543

• Favor may be gained through mass slaughter, bringing souls into the Abyss, or fighting in the Blood War. 502
• Rewards include magic power, complete Abyssal rules, rank advancement opportunities, and titles such as Abyssal Scourger. 545 572 580
• In an Abyssal world, territorial control is the measure of authority. 624
• Conquering an entire layer can grant the authority and crown of an Abyss Overlord, allowing the holder's will to influence that world. 680 682
• Abyssal authority can grant power beyond a demon's natural rank, but it is distinct from true seventh-rank strength. 681 710
• Universe origin bestowed by the Abyss can aid advancement, but those who rely on it to reach the seventh rank must permanently obey the Abyss's will. 706

Conflict with Purgatory

The Abyss has fought the Nine Hells/Purgatory for countless years. Their conflict is especially fierce in Avernus, but individual Abyssal worlds may also collide directly with Purgatory worlds. 535

Event	Outcome
Abyssal world collides with Purgatory	Demon lords may lead legions into Purgatory, while devils attempt to kill the ruling demon lord and seize the Abyssal world. 535
Demon victory	The victorious demon lord may take Purgatory territory back into the Bottomless Abyss. 535
Devil victory	The Abyssal world can remain in Purgatory and become new Purgatory territory. 535
Abyss reclaims territory	The Abyssal Will rewards contributors with rules, energy, and opportunities for advancement. 580

Travel and Abyss Gates

The Abyss is comparatively easy to enter but difficult to leave. Its violent energy can reduce the cost of travel between planes, but it also makes portals and exploitation of its resources extremely dangerous. 294 598

• Demons invade other planes through large blood sacrifices and cross-planar Abyss Gates. 598 600
• An Abyss Gate's true body generally remains in the Abyss, while its activation produces detectable Abyssal fluctuations in the target world. 600
• Building a portal in the Abyss benefits from its abundant energy, reducing concerns about mana shortages during transmission. 598
• Opening a portal to extract Abyssal resources invites danger; the Abyss is described as a place that “deals with” those seeking to take from it. 301
• Planar descent into the Abyss exposes travelers to dangerous high-energy information and distorted perceptions of time. 295

Charles Augustus's Abyssal World

Charles first entered the Abyss through Delis's coordinates, arriving in her lair with Molly, Erika, Bruce, and Scorchflame. He found its dense magical environment immediately compatible with his demonic bloodline. 295 296

He later established Millstone Fortress, expanded through conquest, and gained increasing favor from the Abyss during the war against devils. 525 545 580

After Hachiwote's fall created a vacancy in the layer's authority, Charles's legions conquered the entire Abyssal world. He received its invisible crown and became its Abyss Overlord. 591 680

• Charles used the Abyssal Will's support to separate his world from Purgatory, restoring its planar crystal wall and leaving Anog stranded behind. 681 682
• He developed settlements, fortresses, cities, roads, a massive Abyss Gate, and a canal network to support trade and resource transport. 679 685
• His territory became a source of Abyssal and devil materials for trade with the Wizard World. 604 605 697