Ain

Ain appears wearing a deep violet cloak, metal gloves on both hands, and a featureless mask, hiding a grotesque body reshaped by a prismatic magic stone.

She operates among the remnants of the Evilus faction as Enyo’s right hand, a liaison who rarely reveals herself to the public eye.

She first appears on the 24th floor of the Dungeon, confronting Ais Wallenstein, Lefiya Viridis, and others alongside Revis and Olivas Act.

When Revis is badly wounded by Ais, Ain retreats with the magic jewel they came for, choosing survival and mission over continued combat.

Later, during the Loki Familia’s expedition to the 53rd floor, Ain leads swarms of giant insect-type monsters called Vilga against them.

In the middle of the battle, she becomes distracted searching for something, nearly gets caught in Riveria Ljos Alf’s magic, and only survives by suddenly vanishing via her special powers.

Afterward, she executes the surviving Evilus remnants on the 18th floor when they are spotted by Lefiya and Bell Cranel and fail to protect the prismatic monster Venenetes.

Her actions make clear that she is both a field commander and a merciless cleaner, eliminating liabilities to Enyo’s grand plan.

When the Loki Familia first invades the artificial labyrinth Knossos, they fall into traps and are separated into smaller squads.

Ain accidentally allows Lefiya and Filvis to see her masked form and, without realizing it, inadvertently guides them all the way to a Knossos gate, a mistake that will later contribute to her downfall.

During the First Knossos Offensive, the god Dionysus (Enyo’s true identity) is forcibly sent back to the heavens, sealing the Falna of his Familia.

Driven to despair, Filvis (one of Dionysus’s children) attacks Ain, only to have her neck snapped and her body fed to man-eating flowers called Violas, an event that shatters Lefiya’s mind and leaves her in a hollow, broken state.

Ain’s true identity is Filvis Challia, an elf adventurer formerly known as the “Death Elf” who once belonged to a different Familia.

Her origin as a creature dates back to an incident known as the “Nightmare on the 27th Floor,” where she suffered fatal wounds and essentially died as a person.

At that point, a fragment of a defiled spirit implanted an intensely colored magic stone into her corpse, transforming her into a monster-like being.

This process granted her immense regenerative abilities and made her body host to a unique prismatic core, but also corrupted her nature and severed her from normal mortality.

Filvis was so horrified by her own impurity that she repeatedly tried to kill herself.

However, due to the magic stone’s regenerative power, she could not die, while allies and bystanders around her continued to perish, leading to the legend of the “Banshee,” a cursed elf who survives when everyone else dies.

The City Destroyer Enyo, later revealed as the god Dionysus, discovered the existence of this new creature.

Instead of rejecting her, he accepted her corrupted form and told her he loved the “tainted” her, giving her a new purpose and becoming the object of her fanatical devotion.

Her transformation and powers also created a peculiar side effect: her being split into two distinct personalities housed in one existence.

One was the “original Filvis,” capable of warmth and friendship, while the other was the “creature Ain,” who worshiped Dionysus obsessively and carried out his will without hesitation.

In the Nightmare on the 27th Floor, Finn Deimne, captain of the Loki Familia, had decided early that Filvis’s party was already annihilated.

He prioritized, alongside the Ganesha Familia and Freya Familia, the extermination of Evilus gods and their followers over attempting to rescue her group, indirectly contributing to Filvis’s tragic fate.

Ain’s internal struggle centers on Lefiya Viridis.

While Dionysus becomes her reason to live, her interactions with Lefiya create a second, conflicting axis of loyalty.

As Filvis, she meets Lefiya and gradually opens up to her, finding affection, understanding, and a fragile happiness she never believed she deserved.

However, as Ain, she remains bound to Dionysus’s ambitions, and this dual allegiance tears her apart.

After the First Knossos Offensive, she stages her own death using her clone magic.

She lets a clone body be killed and devoured by man-eating flowers in front of Lefiya, intentionally breaking Lefiya’s heart and sanity to keep her away from Knossos and the looming war.

Her plan is cruel but rooted in twisted kindness: she believes that if Lefiya is too broken to fight, she will live longer and avoid the horrors of Enyo’s schemes.

This conflict between her devotion to Dionysus and her desire to protect Lefiya defines her final arc.

During the Second Knossos Offensive, Ain reappears in front of the recovered Lefiya and the squad led by Bete Loga.

She uses the Daedalus Orb to open a trap in the floor, dropping herself, Lefiya, Bete, and other Loki Familia members down to the 12th floor of Knossos, severing them from the main force.

On this floor, Lefiya confronts Ain with something that has been gnawing at her: a series of “discomforts” that never quite made sense.

She recounts sensing a familiar magical presence trailing her on the 24th floor, Ain’s strangely convenient appearance guiding them to the Knossos gate during the first raid, and the fact that she alone survived while Filvis supposedly died.

By connecting these clues, Lefiya concludes that Ain has been covertly protecting her, even while posing as an enemy.

This revelation leaves both Ain and Bete speechless, breaking the emotional barrier that Ain had constructed around herself.

Lefiya then calls Ain by a name that strikes directly at her core: Filvis.

In response, Ain removes her mask and accepts the accusation, asking when Lefiya realized the truth, thereby confirming that she and Filvis are one and the same.

With her identity exposed, Filvis discards the mask entirely and explains her hidden clone magic and how it allowed her to deceive everyone.

She also admits that during the 53rd-floor battle, she avoided Riveria’s magic by using this duplication ability and had been searching for Lefiya the entire time.

Realizing that she must now fulfill her master’s will without the veil of deception, she releases her clone and fuses completely, preparing to fight Lefiya and the others as her full, monstrous self.

This choice marks the moment she abandons any hope of a quiet life and embraces the role of “Ain, the creature,” for one final battle.

Ain’s power is far beyond that of ordinary adventurers, even among elites.

In her complete creature form, she is described as being stronger than Revis and capable of overwhelming even level 6 powerhouses like Bete Loga.

Her body, once fused, exposes a vivid multi-colored magic stone in her chest.

Her limbs and torso become wrapped in red and purple thorn-like growths, emphasizing her nature as a hybrid of elf, monster, and corrupted spirit fragment.

She displays level 7–class combat prowess, shrugging off attacks that would cripple most high-level adventurers.

Even when Bete and others are strengthened by Haruhime Sanjouno’s level-boosting ability, she continues to dominate the battlefield.

Ain’s regeneration, durability, and hybrid nature make her extremely difficult to kill by normal means.

Her only true weak point is the exposed prismatic magic stone in her chest, which anchors both her power and her cursed existence.

Despite this terrifying strength, she still hesitates when it comes to Lefiya.

Her attacks against Lefiya are emotionally conflicted, as she wants Lefiya to live even as duty demands that she kill her.

Human-Monster Union

Human-Monster Union (Monstrum Union) is a unique and poorly understood skill granted by her corrupted transformation.

Its status description lists terms such as “Hybrid,” “Neo Irregular,” “Status Bug,” and “Defiled Spirit Invasion,” indicating that she has transcended normal rules governing mortals, monsters, and divine blessings.

This ability effectively fuses human, monster, and corrupted spirit traits into a single entity.

It explains her abnormal regeneration, her monstrous form, and her ability to exist outside standard Falna parameters as an anomaly in the world’s system.

Darklight

Darklight is a skill she can activate at will.

It alters her magic power’s glow and wavelength, effectively imbuing her with an aura that interferes with healing magic and recovery effects.

When active, magical healing cast on her, or possibly in her vicinity, is rejected or nullified to a significant degree.

This makes battles against her even more dangerous, as allies cannot simply rely on support magic to recover while she is exerting Darklight’s influence.

Ainserl

Ainserl is her clone magic, the foundation of her dual existence as Filvis and the masked creature Ain.

It is a magic that affirms and “allows” her to exist as separate selves, splitting her into multiple bodies and personalities.

The chant for Ainserl references endless endings and unchanging paths, mirrors and sobbing blades, and a final “answer” that can be understood as “me” or “you.”

This thematic duality mirrors her split identity: one part the gentle Filvis, the other the devoted creature serving Dionysus as Ain.

The dispelling verse speaks of an ending illusion and a returning soul that cannot tear apart the “bond.”

In her final moments, she uses this magic to split one last time, sending the Ain persona to Dionysus and leaving the Filvis persona to die peacefully in Lefiya’s arms, symbolizing the resolution of that bond.

Ainserl halves her power when she is divided, which is why she initially appears weaker in previous confrontations.

Once she undoes the split and returns to a single “complete” body, her true destructive power is unleashed.

Garment of Tainted Concealment

Ain wears a special robe known as the Garment of Tainted Concealment, crafted directly and entirely under her main god’s control.

Its design sacrifices physical defense and durability in favor of concealing her true nature and hiding her corrupted body from divine perception.

The robe is tailored to minimize skin exposure from the neck down, reducing the chances of gods or sharp-eyed adventurers noticing her abnormal physiology.

It incorporates monster materials and magic-faking techniques to mask her aura and camouflage her status, allowing her to move within Orario without immediately alerting deities.

Her metal gloves complement this outfit by hiding any inhuman traits in her hands while also serving as functional combat gear.

Combined with her mask, the ensemble creates a complete, intimidating creature persona, ensuring that no one connects Ain with the elf Filvis.

As a recurring antagonist, Ain clashes multiple times with the Loki Familia throughout the story.

She appears in the 24th-floor incident, the 53rd-floor giant insect raid, and the various Knossos offensives, always tied to Enyo’s schemes.

In the final Knossos battle, after revealing herself as Filvis and fusing into her full creature state, she fights Lefiya, Bete, and their allies in a desperate, chaotic struggle.

Asfi Al Andromeda, Aisha Belka, and Ryuu Lion arrive as reinforcements, and Haruhime Sanjouno empowers the fighters with level-boosting magic, but Ain still maintains the upper hand.

Despite her overwhelming strength, she is mentally crumbling, torn between executing Dionysus’s commands and her unwillingness to kill Lefiya.

Her thoughts become unstable enough that she even considers embedding a magic stone into Lefiya to turn her into a creature as well, so they could “be monsters together,” a horrifying but telling reflection of her despair.

The tide begins to turn when the great bell of Bell Cranel’s Heroic Desire (Argonaut) rings in the distance.

The sound shakes Ain to the core, and the mortally wounded adventurers around her start getting back up and challenging her again, embodying the very “heroic ideal” that defies her corruption.

In the end, Lefiya manages to shatter the magic stone in Ain’s chest.

With her core destroyed, Ain’s monstrous existence begins to unravel, forcing her to make a final choice through Ainserl.

She splits once more into two bodies: one, the Ain persona, goes to Dionysus’s side, where she dies in his arms as his loyal creature.

The other, the Filvis persona, collapses into Lefiya’s embrace, thanks her, smiles, and quietly fades away, ending her tragic life on a note of bittersweet peace.

After Filvis’s death, her remains turn to ash rather than leaving a conventional corpse.

Although she can be seen as a victim of the defiled spirit and Enyo’s manipulations, she also served as an active agent in a plot to destroy Orario, making her a complicated figure in the eyes of the city.

Because of this duality, her ashes cannot be laid to rest in the First Cemetery, where many honored adventurers sleep.

Instead, Lefiya takes her ashes to the Alv Mountain Range, a sacred elven peak, and scatters them to the wind at the summit in a personal, heartfelt farewell.

Filvis’s short staff and dagger remain as her personal relics.

Lefiya inherits these weapons, carrying them as both memento and burden, even as Filvis’s loss shakes her sense of self and purpose.

Ain’s legacy is one of contradiction: monster and elf, victim and perpetrator, friend and enemy.

Her story adds a dark, emotional depth to the world of Orario, showing how even those touched by corruption can still love, protect, and ultimately choose their own ending.