
Cradle · Character
Yerin
Also known as Yerin Arelius, the Sage's disciple, Disciple
- Major
- First seen · Book 1 · Ch. 10
Yerin is a major character in Cradle (Book 1).
- Gender
- female
- Age
- late teens
- First appears
- Book 1 · Ch. 10
- Books
- 4
Yerin begins the series as the scarred, hunted disciple of the murdered Sword Sage, hiding outside Sacred Valley until a soul-oath binds her to the Unsouled Lindon. Inheriting her master's Remnant, she advances under the adoptive guidance of Eithan Arelius, gaining first a single silver sword-arm Goldsign and eventually six, while wrestling with the parasitic Blood Shadow sealed within her. By the time she competes in the Uncrowned King tournament, she has grown from a lone survivor into a formidable Underlord and a core member of the Blackflame Empire's team, and her partnership with Lindon has deepened into romance.
Description
A pale, lean young woman approximately Lindon’s age, with black hair cut absolutely straight and dark eyes. Hair-thin scars cross her face and form a network over her skin, including her hands. She wears ragged black robes and a thick blood-red rope coiled around her waist, and carries a long sword. A sixteen-year-old girl with straight black hair cut sharply across her eyes and shoulders, her face and hands marked by pale scars from countless battles. She wears a tattered black robe cinched by a vivid blood-red rope belt, with a gleaming silver bladed arm extending from her shoulder like a scorpion's stinger. Her posture is always deadly and coiled, as though ready to strike at any moment. A human young woman with visible scars and sword-like Goldsign arms extending from her back. The arms are silver or steel-like; she can withdraw them, and at times manifests six. She is short, with her head reaching about another person's shoulders. Her hair is not otherwise described in the earlier appearance; after her advancement it grows past her shoulders and she cuts the strands from her eyes. She wears Skysworn armor in many scenes and also has black robes and a loose brown robe. After advancing to Underlady, her scars disappear and her Goldsigns look like actual steel blades growing on metal arms from her shoulders. A human young woman, about twenty, with long hair; its color is not established consistently in the supplied evidence. She has dark eyes and six silver sword-arms extending from her back as Goldsigns. In the tournament-era appearance, her skin is smooth and her scars are gone. She wears a black sacred artist’s robe and carries a white sword, often at her waist; she may wear a blindfold while training or fighting.
Connections
Family & partnersFriends & mentorsRivals

Wei Shi Lindonconflicting source relationships
Begins as a suspicious alliance sealed by soul-oath, grows into trust as training partners and comrades, and ripens into a deep romantic bond of mutual support.

Akura Mercycompanion
Companion and teammate during their travels.

Eithan Areliusconflicting source relationships
Adopts her into the Arelius family and becomes her primary teacher, evolving into an adoptive father figure.

Orthoscompanion
Once a foe during the Blackflame Trials, later a trusted team companion.
- BS
Blood Shadowconflicting source relationships
A parasitic spirit within her that grants combat power but resists control, a persistent internal struggle.
- MS
Min Shueiformer acquaintance
The Winter Sage, her master's former fiancée, with whom she shares a fraught connection.
- NS
Naru Saeyateammate
Blackflame Empire teammate who trains and fights beside her.
- SS
Sword Sageconflicting source relationships
Her beloved master whose murder sets her story in motion; she inherits his Remnant, which guides her instincts and advancement thereafter.

Elder Whitehallantagonist
Heaven's Glory elder who hunts her for the Sage's treasures and attacks during her Remnant battle.

Jai Longopponent
Opponent on Shiryu Mountain who spares her after her breakthrough to Highgold.

Sopharanatothrival
A vengeful rival seeking retribution for her sister's death.
Story so far
BOOK 1Unsouled
- Hides from Heaven's Glory disciples hunting her for the Sword Sage's Remnant after his murder
- Swears a soul-oath with Lindon: he aids her against Heaven's Glory, she guides him beyond Sacred Valley
- Disables Elder Rahm with the Path of the Endless Sword's resonance technique while looting the Treasure Hall
- Battles the Sword Sage's Remnant while Elder Whitehall attacks, claiming it as her master's inheritance
BOOK 3Blackflame
- Is adopted into the Arelius family as Eithan's disciple
- Trains alongside Lindon in the Blackflame Trials
- Integrates her master's Remnant and advances to Highgold during her fight with Jai Long, who spares her
- Fights side-by-side with Lindon against Orthos
BOOK 6Underlord
- Bears six silver-bladed Goldsigns after reaching Underlord
- Serves wearing Skysworn armor while training under Eithan
- Travels with Lindon, Mercy, Orthos, and Little Blue as a team
- Contends with the Blood Shadow living inside her
BOOK 7Uncrowned
- Competes on the Blackflame Empire team in the Uncrowned King tournament alongside Naru Saeya
- Uses the Blood Shadow's power in combat despite its difficulty to control
- Faces a complicated reckoning with Min Shuei, the Winter Sage once engaged to her master
- Clashes with rival Sophara, who seeks revenge for her sister's death
- Maintains her bond with Lindon via transmission construct, openly longing for him while apart
Key events
- Book 1
Ch. 16Lindon Meets YerinLindon finds Yerin, the Sword Sage's disciple, hiding in a snowy chasm and convinces her to form an alliance, swearing to help each other escape Sacred Valley. - Book 1
Ch. 20Escape from Sacred ValleyLindon and Yerin raid the Heaven's Glory School's Lesser Treasure Hall, battle Elder Whitehall and the Sword Sage's Remnant, then escape the collapsing Ancestor's Tomb. - Book 3
Ch. 17Jai Clan Attack on AreliusThe Jai clan launches a coordinated massacre against the Arelius family in Serpent's Grave, with Eithan trapped by boundary formations while Cassias fights through the streets. - Book 3
Ch. 19Yerin Advances to HighgoldCornered by Jai Long on the mountain, Yerin finally accepts that her master's Remnant is no longer his voice and crushes it to fuel her advancement, gaining a second Goldsign and the Steelborn Iron body. - Book 6
Ch. 6Night Wheel Valley Competition BeginsAkura Charity opens the Night Wheel Valley to both the Blackflame Empire and Seishen Kingdom, forcing young Truegolds to compete for three Underlord spots in the Uncrowned King Tournament. - Book 6
Ch. 9Seishen Kingdom's Coordinated AttackKing Dakata orders a surprise attack on Blackflame Empire forces in the Night Wheel Valley, with Prince Kiro and Meira specifically targeting Lindon while the Emperor's cloudship is ambushed. - Book 6
Ch. 21Lindon, Yerin, and Mercy Advance to UnderlordWhile battling Seishen forces in the Akura vault, Lindon, Yerin, and Mercy each achieve their Underlord revelations and advance simultaneously during the fierce combat. - Book 7
Ch. 10Uncrowned King Tournament BeginsThe Uncrowned King Tournament opens at the Ninecloud Court with Monarchs Northstrider and Reigan Shen in attendance, featuring competitors from multiple factions including Lindon, Yerin, Eithan, Mercy, and Sophara. - Book 7
Ch. 20Lindon vs Yerin DuelIn a shocking twist, Northstrider pits Lindon against Yerin in the fourth round of the Uncrowned King Tournament, forcing the close companions to fight each other for advancement. - Book 7
Ch. 21Penance Awarded as Grand PrizeAbidan messenger Kiuran interrupts the Uncrowned King Tournament to award Penance, a divine weapon capable of killing any being, as the new grand prize of the competition.
Gallery
Book 1: Unsouled
Book 3: Blackflame
Book 6: Underlord
Book 7: Uncrowned
Appearances
Meet Yerin in Bookworm
Meet Yerin in your EPUB — spoiler-safe to the book you're on.



