Eris

Biodata

Name	Eris Boreas Greyrat (艾莉丝)
Alias(es)	Lady Eris; Little Eris
Gender	Female
Affiliation	Boreas Greyrat House; disciple of Cain Brand; trained alongside Ghislaine and Auber
Occupation/Role	Noble young lady; swordswoman; Cain's disciple and ward
First Appearance	101

Power Progression

Stage / Realm / Level	Chapter	Notes
Quasi-Intermediate Sword God Style; Beginner North God Style	132	Built her foundation through persistent training under Cain, Ghislaine, and Auber; also followed mana-training methods.
Qualified dual-style swordswoman	145	Recognized as proficient in both Sword God Style and North God Style; Auber additionally taught her some Water God Style techniques.
Advanced Swordsman	146	Announced her advancement after years of training; Cain subsequently began teaching her the fundamentals of Battle Aura.

Background

Eris first encountered Cain and the starving Ghislaine after they emerged from the wasteland into the Fittoa Region. Although initially stern and suspicious, she shared two loaves of bread when Cain explained they had not eaten for months. Cain never forgot this act of kindness. 101

After Sauros and Philip Boreas Greyrat sheltered Cain and Ghislaine, Cain became Eris's personal guard and, alongside Ghislaine, one of her swordsmanship teachers. Eris initially rejected tutoring and wanted Cain only as her guard, but changed her mind after witnessing his Fourfold Blade of Light cut through armored guards using a wooden sword. 102 103

Cain's protection of Eris was also tied to Orsted's instructions: Eris was identified as vital to bringing the Fittoa Region into Princess Ariel's future faction. Cain nevertheless treats her safety as a personal obligation, both because of Orsted's request and because she saved him. 95 158

Appearance

Eris is a red-haired young noble girl with ruby-red eyes and a prominent cowlick. At their first meeting, she wore a delicate white dress and sunhat; she is often described standing with folded arms, legs apart, and an aggressively proud expression. 101 102

• Bright red hair, sometimes styled into twin-tails when attempting formal manners. 102 107
• Ruby-like red eyes. 101
• A distinctive red ahoge/cowlick. 101 107
• Her demeanor and fighting style increasingly resemble a beastkin warrior rather than a conventional noble lady. 133 145

Personality

Eris begins as spoiled, stubborn, and highly resistant to reading, writing, etiquette, and teachers who cannot hold her interest. She is quick to anger, dislikes being restrained, and tries to bargain around punishments or lessons she finds boring. 102 107 127

Her strongest trait is her refusal to accept defeat. She responds to Cain's overwhelming superiority not by abandoning swordsmanship, but by declaring that she will surpass him and become the Sword God herself. This determination drives her intense training in multiple sword styles. 109 148 152

Despite her pride, Eris is compassionate and fiercely loyal. Her decision to feed strangers in need formed the basis of Cain's attachment to her, and she later vows to protect Ghislaine, Cain, and Roxy. 101 116 132 149

Abilities & Skills

Swordsmanship

Eris trains primarily in Sword God Style under Cain and Ghislaine, while Auber develops her North God Style. Her combat is forceful, fast, and instinctive rather than elegant or conventional. 132 145

• Uses both Sword God Style's direct offense and North God Style's practical, deceptive methods. 125 133 145
• Defeated Water God Style prodigy Isolte after losing her wooden sword, using punches, smoke bombs, and a rear naked choke. 136
• Can pressure stronger sparring partners with relentless full-force attacks, though this rapidly drains her stamina. 133
• Has attempted the Blade of Light repeatedly, but has not demonstrated a successful use; an early attempt fractured both of her hands. 108 152

Battle Aura Training

Cain began teaching Eris Battle Aura after she attained Advanced Swordsman rank, identifying it as a fundamental power for warriors. 147

• Her stated goal is to progress from Sword Saint through Sword King and Sword Emperor before surpassing Cain. 148
• Full-body Battle Aura coating remains beyond an Advanced Swordsman; it is described as a hallmark of Sword Saint rank. 148

Magic

Cain teaches Eris basic magic in addition to swordsmanship. 105 126

• Learned the Beginner Fire Magic spell Fireball with Cain helping channel mana through her hand. 127
• Later used invisibility magic to avoid Cain after their sparring dispute. 153
• Her early magical education was hindered by her inability and unwillingness to read spell texts. 127

Academic and Noble Instruction

Cain teaches Eris reading, writing, and noble etiquette in the evenings after she drives away other tutors. 133 141

• Learns etiquette quickly when Cain personally teaches her. 133
• Continues to prefer sword and magic training over academic study. 127 145

Equipment / Items

• Wooden training sword — her usual weapon during lessons and sparring. 107 152
• Smoke bombs — used as a North God Style-inspired combat tool against Isolte and Cain. 136 152
• Wilderness survival gear — given by Auber as a birthday gift. 134
• Lucky necklace — given by Ghislaine for her birthday. 134

Relationships

• Cain Brand — Her master, personal guard, and central emotional attachment. Eris admires his strength, repeatedly declares that she will surpass him, and wants him to remain by her side. 102 109 147 149
• Ghislaine — Co-teacher and mentor in Sword God Style. Eris trusts her guidance but has also challenged and physically lashed out at her when resisting lessons. 102 108
• Auber — North God Style instructor and sparring partner. His practical techniques broaden Eris's fighting style. 121 125 133
• Philip Boreas Greyrat — Her father. Philip employs Cain partly to secure Eris's future and protect her from political marriage. 103 104 110
• Sauros Boreas Greyrat — Her grandfather and lord of the Fittoa Region. He helped shelter Cain and Ghislaine after Eris found them. 102
• Hilda Greyrat — Her mother, who worries for Eris when she leaves home with Cain and Ghislaine. 134
• Roxy Migurdia — Cain's fiancée and teacher. Eris promises to protect Roxy, though she is jealous of Cain's bond with her. 132 149 152
• Isolte Cruel — Water God Style prodigy defeated by Eris. Their first encounter establishes a possible future rivalry. 136 137

Story Role / Major Arcs

Rescue in Fittoa and Becoming Cain's Disciple

Eris saves Cain and Ghislaine from starvation by sharing her food, then becomes the young noblewoman Cain is assigned to guard. Her fascination with the Blade of Light leads her to accept Cain as her teacher. 101 102 103 105

Training and the Sword God Dream

Under Cain, Ghislaine, and Auber, Eris abandons much of her former noble-lady behavior for a life centered on combat. She declares her ambition to become the Sword God and surpass Cain. 109 132 145

Water God Style Dojo

Eris accompanies Cain to the Water God Style dojo and fights Isolte in his place. Her unconventional victory humiliates the dojo's expectations of her as a sheltered noble child and earns Reida's respect. 136 137

Buena Village Training

During the group's stay in Buena Village, Eris reaches Advanced Swordsman rank and begins Battle Aura training. She continues to grow more attached to Cain, pledging to defeat him and make him stay with her. 146 147 149

The Gap with Cain

A sparring match forces Eris to confront the enormous difference between herself and Cain: he catches her full-force strike one-handed and defeats her smoke-bomb tactic immediately. Hurt but not deterred, she resolves to treat him as an enemy to overcome. 152 153

Notable Quotes

“I'm going to become the Sword God!” 109

“Once I defeat Master Cain, I'll go ask Master's master. Just like Cain protected me, I'll protect Master Cain too! And Master's master Roxy!” 149