Eris

Biodata

Feature	Information
Name	Eris (艾莉丝)
Alias(es)	Eris Boreas Greyrat; Eris Greyrat 92 107
Gender	Female
Affiliation	Greyrat family; formerly the Boreas Greyrat household 18 93
Occupation/Role	Swordswoman; Sword King; Rudeus Greyrat's former student 18 107
Status	Alive 322
First Appearance	Chapter 18: “Eris”

Power Progression

Stage / Realm / Level	Chapter	Notes
Intermediate swordsmanship	22	Reached before her tenth birthday; Ghislaine considers her a swordsmanship genius capable of matching an average knight.
Advanced swordsmanship	24	Advanced from Intermediate over the following two years, surpassing Rudeus as a sword-training partner.
A-Rank Adventurer	40	Registered as an A-Rank adventurer alongside Rudeus after their journey through the Demon Continent.
Sword King	107	Recognized as a renowned Sword King alongside Ghislaine while assisting Ariel.

Background & History

Rudeus's Student

Eris is Rudeus Greyrat's cousin through the Greyrat family and is two years older than him. Their first meeting is openly hostile: she objects to being taught by someone younger, attempts to strike him, and fights him after he insists that she respect her teacher. Although she initially submits only reluctantly, she accepts Rudeus as both her opponent and teacher. 18

Her early education progresses unevenly. Eris excels at swordsmanship but struggles with arithmetic, etiquette, and dancing; Rudeus identifies that her sword-trained instincts make her anticipate a dance partner's movements, then helps her rely on musical cues instead. 22 After her tenth birthday, she becomes more serious about lessons and stops skipping class. 24

Rudeus earns her acceptance as a magic instructor by demonstrating a powerful Fire Ball. At her birthday ball, he gives her a staff and formally recognizes her as his disciple; Eris calls him “Master Rudeus” for the first time. 19 23

Adventure and the Teleportation Incident

After the Teleportation Incident, Eris travels with Rudeus and Aisha across the Demon Continent. She and Rudeus work as adventurers under the Greyrat name, eventually attaining A-Rank status. 35 40 68

When the group reaches the Fittoa refugee camp, Eris learns of the extensive losses suffered by her homeland, including the disappearance or death of her parents. She is then pressured by Alphonse with a proposal that she become Pylemon Notos Greyrat's concubine in exchange for aid to the territory. 50

Sword Sanctum Training

Eris refuses to accept a future in which she cannot protect Rudeus. She leaves for the Sword Sanctum with Ghislaine, promising to return once she is strong enough to defend him. 52

Her years of training transform her into a tall, muscular Sword King with callused hands. Despite her new confidence and strength, she worries that Rudeus may no longer find her attractive and remains deeply attached to him. 87 107

Eris returns to Rudeus after seeing Orsted leave his house and immediately attacks the Dragon God, believing Rudeus to be in danger. She stops only after seeing Rudeus safe and accepting that Orsted is his ally. 92

Marriage and Family

Eris moves into Rudeus's household, marries him, and builds a close relationship with his other wives, Sylphie and Roxy. 93 98 115 She becomes pregnant with Rudeus's first child and later raises their daughter Windsor, encouraging her swordsmanship from an early age. 116 205

During Rudeus's secret experiments, Eris notices the emotional toll they take on him. Though he asks her not to tell Sylphie and Roxy, she ultimately confides in them because she believes the family should share his burdens. 104 115

Later, Eris revisits the ruins of the Boreas residence in Fittoa with Rudeus and their children. She reflects that her childhood home is no longer where she belongs. 286

Appearance

Eris has bright, curly red hair and upward-tilting eyes that contribute to her fierce first impression. 18 After training at the Sword Sanctum, she becomes notably tall and muscular, with a toned physique and sword-callused hands. 87

• Bright red, wavy hair 18
• Fierce expression and sharp, upturned eyes 18
• Tall, athletic build developed through intensive sword training 87
• Prefers practical swordswoman's clothing, though she worries about appearing insufficiently feminine beside Rudeus. 107
• Wears a vivid red swimsuit with purple details at the family water park. 322

Personality

Eris begins as arrogant, haughty, impulsive, and quick to settle disagreements with violence. She has strong pride and initially resists Rudeus's authority, but she gradually learns restraint and becomes more earnest in her studies. 18 21 24

She is direct about her emotions, especially her love for Rudeus. Eris trusts him almost completely and reacts fiercely when others insult or question him, even dismissing concerns that he might be using her strength. 49 87

Despite her bluntness, Eris becomes more considerate with age. She worries about Rudeus's exhaustion, supports Windsor's wishes, and recognizes when her own jealousy or pregnancy-related mood changes have hurt others. 104 131 180 185

Abilities & Skills

Swordsmanship

Eris's defining talent is swordsmanship. Her natural aptitude carries her from Intermediate to Advanced rank at a young age, and later to the rank of Sword King. 22 24 107

• Easily defeats a Two-Headed Troll during a B-rank commission. 35
• Challenges Paul Greyrat to experience the swordsmanship of a powerful opponent. 27
• Fights alongside Ghislaine against Orsted, though Orsted blocks her attacks and throws her aside with ease. 92
• Loses a spar to Kino Blitz, the current Sword God, demonstrating that she still has stronger opponents to pursue. 300
• Trains Windsor and takes pride in her daughter's potential with a sword. 180 205

Fire Magic

Eris can use Fire magic and received a staff from Rudeus as one of his disciples. 23 167

• Can contribute Fire magic in battle alongside Roxy and Sylphie. 167
• Her Fire magic remains Intermediate-level and is far weaker than Roxy's ice magic. 167

Equipment

• Sword — Eris's primary weapon; Rudeus buys her a sword during their first outing in Roa and later gives her another sword set with a red gemstone. 21 131
• Mage's staff — Presented by Rudeus when he acknowledges her as his disciple. 23

Relationships

• Rudeus Greyrat — Cousin, former teacher, husband, and the person Eris dedicates herself to protecting. 18 52 98
• Ghislaine — Swordsmanship teacher and long-time guardian who accompanies Eris to the Sword Sanctum and later reunites with her. 19 52 92
• Sylphie Greyrat — Co-wife and member of Eris's close household circle; the two support one another in family discussions. 25 115
• Roxy Greyrat — Co-wife and confidante who helps Eris confront Rudeus's secrets and worries. 115 180
• Windsor Greyrat — Daughter; Windsor admires Eris's sword practice and begins developing similar talent. 138 205
• Nina — Friend from the Sword Sanctum who supports Eris while teasing her over her devotion to Rudeus. 87 300
• Isolte — Sword Sanctum friend who worries that Eris's trust in Rudeus may be too unconditional. 87
• Ariel Anemoi Asura — Political ally whom Eris protects during Ariel's struggle for the Asura throne. 107 113

Notable Quotes

“When I'm stronger than Ghislaine, stronger than the Dragon God—when I'm so strong that no one can defeat me, I'll come back.” 52

“I only wanted to become stronger for Rudeus in the first place.” 87

Trivia

• Eris's difficulty with arithmetic persists into adulthood; after leaving the Sword Sanctum, Ghislaine admits she was cheated because she had forgotten the arithmetic Rudeus taught her. 202
• She has a strong fondness for the Beast Race Holy Beast, Big White, and often holds it too tightly. 42 138
• Her daughter Windsor's red hair, combat stance, and swordsmanship remind Rudeus of Eris as a child. 205