Eroded are individuals who have undergone transformation due to exposure to Ash, granting them supernatural abilities while fundamentally altering their existence. They serve as the primary combatants against Testa and other Ash-related threats.

Overview

Eroded are humans affected by Ash Syndrome who have developed the capacity to wield Ether, a form of emotional energy that enables combat against Ash entities. Through this transformation, they gain abilities far beyond normal human limits, including enhanced strength, resilience, and unique powers tied to their inner emotional state.

Unlike ordinary humans, Eroded are no longer harmed by Ash itself. This immunity comes at the cost of instability, as their bodies and minds are constantly at risk of being overtaken by the same force they resist.

Transformation

Eroded are capable of entering a transformed state, allowing them to draw out their full power. This transformation amplifies their Ether output and enhances their abilities, often altering their appearance into a more stylized or abstract form that reflects their inner self.

In later stages, some Eroded can awaken into a higher state known as Another Spirit, triggered by intense emotional change. While significantly more powerful, this state increases the risk of losing control and accelerating their descent into instability.

Another Spirit

The Eroded awaken when a profound change occurs within their own heart.

Another Spirit is an advanced transformation state achieved by certain Eroded when subjected to a significant emotional shift. This form represents a further amplification of their Ether output, allowing them to surpass their normal limits and exhibit drastically increased combat capability.

Unlike standard transformation, awakening into Another Spirit is not a controlled or routine process. It is typically triggered by intense internal conflict, resolve, or emotional breakthrough, causing the Eroded's power to surge beyond its usual constraints. This results in a more pronounced change in appearance and ability, often reflecting the individual's inner state more strongly than before.

This power comes with severe risks as the heightened instability of Ether in this state greatly increases the likelihood of Testification, as the boundary between control and collapse becomes significantly thinner. As such, Another Spirit is considered both a powerful evolution and a dangerous threshold, where an Eroded approaches the limits of their humanity.

• It is also referred to as Anasupi (アナスピ) by Kuno Kirara and Protagonist. ^[1]
• Protagonist has a vision of the moment when the members will awaken into this form under specific conditions.

Testification

One of the greatest risks faced by Eroded is Testification, a state in which an Eroded loses control of their power and transforms into a hostile Ash entity.

Testification can occur through:

• Excessive Ether instability
• Emotional collapse or loss of self
• External interference or corruption

Once Testification occurs, the individual becomes a Testa-like being and is typically beyond recovery, often requiring termination by their allies. In some cases, remnants of the individual's consciousness may persist temporarily, but these instances are rare and unstable.

Testa

Testa are hostile entities formed from Ash with an objective to steal Ether from humans and serve as the primary enemies encountered by Eroded in contaminated areas. They vary in form and strength, ranging from small, instinct-driven creatures to more dangerous variants that act in coordinated groups.

While many Testa appear to be purely manifestations of Ash, there is a direct connection between them and Eroded. Through a process known as Testification, an Eroded who loses control of their Ether can transform into an Ash-based entity resembling a Testa. In some cases, these transformed individuals may retain fragments of their original consciousness for a brief period, though they are generally considered beyond recovery.

Testa are often drawn to strong sources of Ether and will gather in large numbers around areas of high activity. More powerful variants, such as Queens, act as focal points for surrounding Testa, influencing their behavior and significantly increasing the danger of an area. As a result, eliminating a Queen is often key to dispersing nearby Testa and reclaiming Ash-infested zones.

Due to their origin and connection to Eroded, Testa represent both an external threat and a constant reminder of the risks faced by those who fight against the Ash.

• The core of a Testa is a gray nucleus.

Queens

In certain cases, Eroded undergoing Testification can evolve into higher-order entities known as Queens. These beings possess significantly greater power and act as leaders for surrounding Testa.

Queens have been shown to:

• Retain fragments of human consciousness in early stages
• Influence and command nearby Testa
• Act as focal points for Ash activity within an area

Later revelations suggest that the transformation into a Queen can be artificially induced or manipulated, further blurring the line between natural and forced evolution.

Ether

Ether is the primary energy source used by Eroded. It is described as a manifestation of emotional energy and is required for all forms of combat and ability usage.

All actions performed by an Eroded consume Ether, and depletion of this energy results in death. To prevent this, Eroded rely on Straple, a lollipop-shaped drug developed by Houraikan Pharmaceuticals, which replenishes Ether during or after combat.

Proper management of Ether is critical, as both overuse and imbalance can lead to dangerous side effects.

Limitations and Risks

While Eroded are humanity's primary defense against the Ash, their existence is inherently unstable. Key limitations include:

• Constant reliance on Ether for survival
• Risk of Testification under physical or emotional strain
• Psychological burden from prolonged exposure to combat and loss
• Vulnerability to external manipulation affecting their Ether or state of mind

These factors make the role of an Eroded both essential and dangerous, as they walk a constant line between power and self-destruction.

Role in Combat

Eroded form the backbone of organized efforts against Ash outbreaks. Within institutions such as Mitsuishi Hinomori Academy, they are trained and deployed in specialized units to eliminate Testa and reclaim contaminated areas.

Their effectiveness depends not only on individual strength, but also on coordination, emotional stability, and the ability to manage Ether efficiently in prolonged engagements.

1. ↑ Blue Reflection Sun — GachaScenario-Gacha-0220 / EventScenario-Magna-Magna-08-2