Her bond with Rudeus is the core of her growth. After their initial separation, she spends years training specifically to become a person worthy of standing by his side. They eventually marry, and within the religion Rudeus creates, she is enshrined as the Goddess of War .

She is a prodigy in the Sword God style , eventually earning the rank of Sword King after years of intense training at the Holy Land of Swords. She also masters techniques from the North God style, making her a highly versatile and unpredictable combatant.

Eris remains physically active into her old age, eventually passing away at 74 from old age after her usual morning run and sword practice.

Her name is likely inspired by the Greek goddess of chaos and discord, Eris , while "Boreas" refers to the north wind.

As a member of the Boreas Greyrat household, she inherited the family's distinct "Boreas bloodline" traits, including a deep fondness for beast-folk and a strong, often dominant libido. Trivia & Legacy

While she was taught etiquette, math, and languages in her youth, she eventually forgot most of it, focusing almost entirely on her physical training.

Eris starts as a classic "tsundere," prone to physical outbursts and emotional volatility. Over time, her aggression shifts into a fierce protectiveness for Rudeus, though she remains socially blunt and easily excitable by new discoveries.