Ais

Biodata

Feature	Value
Name	Ais Wallenstein (艾丝)
Alias(es)	Sword Princess
Gender	Female
Species/Race	Fairy Spirit; her Fairy Spirit constitution was awakened through William's transformation 646 647
Affiliation	Loki Familia
Occupation/Role	Adventurer; Loki Familia executive and frontline swordswoman 170
Status	Active
Known Level	Level 5 prior to her subsequent level-up preparations 127 164

Power Progression

Stage / Realm / Level	Chapter	Notes
Level 5	127	Identified as a Level 5 adventurer during her spar with the newly promoted William.
Level 5 — advancement requirements met	158 159	Her weighted middle-floor training restored rapid growth; all attributes except Strength and Endurance reached S, with only a Great Feat needed for advancement.
Level 6 advancement preparation	164	After defeating the variant Amphisbaena, she returned to have Loki update her status and prepare her Level 6 advancement.
Fairy Spirit	646 647	William awakened her Fairy Spirit blood and formed a contract with her, greatly increasing her power and granting new abilities for the battle against the One-Eyed Black Dragon.

Background / History

Ais's origins were unknown even to herself for much of her life. Riveria found her in the Dungeon's deep levels ten years earlier. She is later revealed to be the daughter of Albert, the Mercenary King, and the spirit Aria. 641

Her central purpose was to personally kill the One-Eyed Black Dragon, fulfilling her father's unfinished task and resolving her own obsession with monsters. 641 645

Phryne of the Ishtar Familia repeatedly targeted Ais out of jealousy. Phryne defeated her when Ais was Level 2, fought her to a standstill when Ais was Level 3, and was eventually defeated by Ais when both reached Level 5. 169

Appearance

Ais is a blonde, golden-eyed young swordswoman usually seen in light armor, blue greaves, and with a sword at her side. Following her transformation, she develops long pointed ears characteristic of a Fairy Spirit. 125 131 647

• Golden hair and golden eyes 125 131
• Usually wears silver light armor and blue greaves 125 131
• Carries the Despair Sword during her earlier Dungeon expeditions 127 164
• Gains long pointed ears after becoming a Fairy Spirit 647

Personality

Ais is stoic, direct, and overwhelmingly focused on combat and becoming stronger. She can be socially unaware—such as following William to ask about his status without understanding the privacy involved—and tends to approach unfamiliar emotional situations with the same earnestness she gives training. 125 131

Despite her reserved demeanor, she is deeply considerate of people she values. She sought Riveria's advice on how to thank William for helping her improve, apologized when she unintentionally injured him during their spar, and trusted him enough to reveal her connection to the Black Dragon. 128 131 641

Her hatred of monsters, especially the Black Dragon, can provoke dangerous surges of black wind and threaten her reason. By the final battle, however, she is able to activate Princess of Revenge while remaining clear-minded. 645 649

Abilities & Skills

Swordsmanship

Ais is an elite close-range swordswoman whose speed and technique allow her to fight powerful Dungeon monsters directly.

• Her attacks can cross more than a hundred meters through dragon fire to reach an opponent. 164
• She split the variant Amphisbaena's body in two with a single decisive strike. 164
• William later incorporates techniques observed from sparring with Ais into his own sword style. 249

Wind Magic — *Tempest* / *Ariel*

Ais's sole magic envelops her body and blade in destructive wind, functioning as both armor and offense. 119 164

• Deflects incoming fireballs with a wind armor surrounding her body. 119
• Enhances mobility, allowing rapid movement and aerial combat. 119 648
• Channels cutting wind into her sword to shred monsters and terrain. 156 164
• Its extreme cutting nature heavily damages her weapons; even an Indestructible armament can fail under repeated use. 164

*Princess of Revenge*

Ais's monster-slaying skill converts hatred and anger toward monsters into immense offensive power. It is regarded by Loki as the strongest offensive ability in Orario in a thousand years. 163 649

• Turns her normally green wind black and greatly increases its destructive output. 163 649
• Is especially effective against monsters and other species she recognizes as enemies. 645
• Previously risked clouding her judgment and driving her berserk. 649
• After becoming a Fairy Spirit, she can use it against the Black Dragon without losing control. 649

Hand-to-Hand Combat

Ais has trained in unarmed fighting under Tiona and Tione, though she rarely used it before losing access to a suitable sword. 168

• Defeated Aisha with hand-to-hand combat while her borrowed blades could not withstand Ariel. 168
• Can continue fighting when deprived of her primary weapon. 168

Fairy Spirit Constitution

William awakens Ais's dormant Fairy Spirit blood by transforming her and making a contract with her. 646

• Grants a major increase in physical and magical power. 646 647
• Gives her several new attacks and special abilities that emerge in her mind after the transformation. 646
• Enables flight during her assault on the One-Eyed Black Dragon. 648
• Leaves her reliant on William's influence as part of the transformation's consequences. 646

Equipment / Weapons / Items

• Despair Sword — Ais's primary sword; its Indestructible attribute was necessary to endure her wind magic, but it shattered after she killed the Amphisbaena. 162 164
• God Cutter — Her weapon during the Black Dragon battle; its defining trait is extreme sharpness capable of cutting solid matter. 649
• Orichalcum weighted bracelets and anklets — Used to suppress her physical ability to approximately Level 3 for more effective middle-floor training; the weighted equipment cost 100 million Valis. 129 130

Relationships

• William Spengler — Training partner, adviser, and trusted companion. His weighted-training method restored her growth, and he later awakened her Fairy Spirit constitution so she could confront the Black Dragon herself. 129 646
• Riveria Ljos Alf — Adoptive maternal figure who found Ais in the Dungeon's deep levels. Riveria advises her on expressing gratitude and later encourages her to take initiative with William. 131 641 654
• Loki — Goddess and patron of the Loki Familia. Loki is shocked by Ais's growth and seeks comfort from her after learning Ais defeated the Black Dragon. 651 652
• Lefiya Viridis — Close friend and Dungeon companion. Lefiya becomes visibly jealous when William replaces her as Ais's morning training partner. 132 133
• Tiona Hiryute and Tione Hiryute — Fellow Familia members who taught Ais hand-to-hand combat. 168
• Bete Loga — Fellow Loki Familia adventurer who supports Ais in battle and urges retreat when she is endangered by flying monsters. 119
• Kishiryu Yukina — Ally during the Black Dragon expedition. Yukina defended Ais from dragon breath and supported her decision to take the primary attacker role. 649
• Aisha Belka — Initially an opponent during the Ishtar Familia conflict; Ais accepted Aisha's proposal to save Haruhime and remove Phryne as an obstacle. 170
• Sanjo Haruhime — Ais helped bring Haruhime into the Loki Familia after learning of her level-boosting magic and imminent sacrifice. 170 175
• Phryne Jamil — Longstanding enemy whose jealousy led to repeated conflicts with Ais. 169
• One-Eyed Black Dragon — The monster Ais sought to kill in revenge for her father; she ultimately decapitated it. 641 650

Story Role / Major Arcs

Training with William

After becoming frustrated by her slow growth, Ais spars with William and learns that fighting opponents far below her level no longer produces meaningful progress. She adopts expensive weighted equipment to suppress her strength and train effectively on the middle floors. 127 129 130

Rapid Growth and Amphisbaena

The training method greatly improves Ais's status growth, allowing her to meet the requirements for a new level-up. She then uses Princess of Revenge and Ariel to kill the variant Amphisbaena, though the strain shatters the Despair Sword. 158 159 164

Ishtar Familia Conflict

While returning without her sword, Ais confronts Phryne and the Ishtar Familia. She trusts William to fight Phryne, defeats Aisha's forces despite inadequate weapons, and agrees to help transfer Haruhime into the Loki Familia. 165 166 168 170

Black Dragon Expedition

Ais reveals her origins and her reason for pursuing strength to William. After her monster hatred erupts out of control, William offers her the chance to personally face the Black Dragon and transforms her into a Fairy Spirit. 641 645 646

Defeat of the One-Eyed Black Dragon

On the seventy-first floor, Ais wounds the Black Dragon, withstands its attacks with Yukina's support, and activates Princess of Revenge without losing her reason. She delivers a final slash that decapitates the Dragon, finally achieving closure over her thousand-year obsession. 648 649 650 651

Trivia

• Ais considers fighting monsters and eating Potato Croquettes the two most important things in her life. 163
• She cannot swim and is poorly suited for water combat. 647
• Her blackened wind during Princess of Revenge reflects the hatred fueling her monster-slaying power. 163 649