Mu Xi

Biodata

Feature	Information
Name	Mu Xi (慕曦)
Alias(es)	Xi'er; Senior Sister
Gender	Female
Affiliation	Heaven Dou Blacksmith Association; Blood God Legion
Occupation/Role	Spirit Master; Forging Grandmaster; Battle Armor Master
First Appearance	Chapter 11
Martial Soul	Blazing Sun Martial Soul
Battle Armor	Jin (One-Word); Xi Jin (Two-Word)

Power Progression

Stage / Realm / Level	Chapter	Notes
Two-Ring Great Spirit Master	11	Challenges Lin Jin after meeting him as Mu Chen's new disciple; demonstrates fine fire-element control and is a Level 1 Blacksmith.
Level 2 Blacksmith	19	Identified as Mu Chen's daughter and a Level 2 Blacksmith.
Three-Ring Spirit Venerable	14	Graduates from Eastsea Academy's Intermediate Department.
Level 4 Blacksmith	57	Reaches Level 4 forging before Lin Jin's departure for the Star Luo Continent.
Four-Ring Spirit Ancestor	87	Breaks through to the four-ring realm after settling in Heaven Dou City.
Near Level 5 Master Craftsman	87	Receives frequent guidance from Zhen Hua.
Spirit Sea Realm Spiritual Power	106	Breaks through before reaching level 40; gains the capacity to fuse with a Black Ten-Thousand-Year Spirit Soul.
Level 43 / Four-Ring Spirit Ancestor	106	Her Second Spirit Soul is a Black Ten-Thousand-Year Spirit Soul, raising her Soul Power to level 43 upon breakthrough.
Level 5 Forging Grandmaster	106	Achieves Level 5 forging alongside level 48 Soul Power.
One-Word Battle Armor Master	106	Successfully fuses with her One-Word Battle Armor before age eighteen.
Level 48	106	Her One-Word Battle Armor allows combat strength approaching that of a Spirit Saint.
Level 50	139	Registers with the Blood God Legion as a seventeen-year-old Level 50 Spirit Master.
Level 6 Forging Grandmaster	139	Produces a binary Spirit-Sentient Alloy exceeding 90% fusion; establishes herself as one of the legion's scarce high-level blacksmiths.
Spirit Abyss Realm / Level 62 Spirit Emperor	160	Fuses with the legendary Sand Demon Worm King; gains a hundred-thousand-year torso bone and Ultimate Fire.
Level 66	211	Wears Xi Jin and possesses four black and two red Spirit Rings.
Level 67	212	Advances after fighting Gu Yuena.
Spirit Saint	228	Reaches seven rings with four black and three red Spirit Rings.
Level 76	258	Reaches level 76 after seclusion spent nourishing the Fusang Divine Tree.

Background

Mu Xi is the daughter of Saint Craftsman Mu Chen and Yuan Bao'er. Initially a Two-Ring Great Spirit Master, she confronts Lin Jin after her father accepts him as a disciple, demanding a spar before she will acknowledge him as her junior brother. Although competitive and jealous of Mu Chen's apparent favoritism, she quickly accepts Lin Jin as family and promises to protect the secret of his Lotus Flower Flame's refining effect. 11 13

Mu Chen trained her in forging from an early age. Mu Xi herself insists that she likes blacksmithing, even when her father considers shifting more of her attention toward Spirit Master training because of the potential of her Blazing Sun Martial Soul. 24

Her development accelerates through training with Lin Jin, guidance from Zhen Hua, and successive Spirit Soul upgrades. By the time she enters the Blood God Legion, she is both a Level 6 Forging Grandmaster and a One-Word Battle Armor Master, allowing her to establish an independent Forging Room within the legion. 106 139 141

Appearance

Following her fusion with the Sand Demon Worm King, Mu Xi's appearance becomes markedly radiant and heat-infused. 160

• Flowing golden hair with a crystalline sheen. 160
• Red eyes resembling two burning suns. 160
• Fair, crystalline-looking skin strengthened by the fusion of her Spirit Soul and torso bone. 160
• Radiates extreme heat when releasing her Blazing Sun power. 160

Personality

Mu Xi is fiery, proud, and highly competitive. Her first reaction to Lin Jin is to test him in battle, and she is angered when Gu Yue ignores her or when Gu Yuena repeatedly seeks access to Lin Jin. 11 19 211

She is also protective and deeply loyal. She supports Lin Jin after his conflicts, worries about his safety, and refuses to regard herself as someone who must remain behind while he faces danger. 26 96 106

Despite her teasing manner, Mu Xi is determined to advance through her own efforts rather than live in Lin Jin's shadow. She deliberately shifts more time from forging to cultivation, pursues Battle Armor mastery, and seeks the strength needed to stand beside him as an equal. 96 228 257

Abilities & Skills

Blazing Sun Martial Soul

Mu Xi possesses a fire-element Martial Soul that grants exceptional precision and battlefield control.

• Condenses and disperses fireballs through direct elemental control rather than relying solely on Spirit Skills. 11
• Functions primarily as a long-range combat style, with firepower suited to bombardment and area denial. 111
• Evolves into Ultimate Fire after her fusion with the Sand Demon Worm King. 160
• Her Ultimate Fire can vaporize Gu Yuena's water-element attack. 211

Spirit Skills

Mu Xi's Spirit Skill system is built around heat accumulation, ranged damage, detonation, and defensive spacing.

• Fireball — Offensive fire attack that can infuse heat currents into a target. 116
• Repelling Fire Ring — Knocks opponents away and provides self-preservation against close-range threats. 115 116
• Three Suns Shining — High-damage fire attack used to finish the two-thousand-year Crystal Bear. 26
• Sunlight Glow — Ignites targets with rosy sunlight; used in her defeat of a ten-thousand-year Blood Bear. 115
• Sunset Meteor — Sixth Spirit Skill; manifests a falling blazing sun with large-scale destructive power. 168 211
• Sun Sand Demon — Summons armored Sand Demon warriors with sun-like eyes. 211
• Sunlight Scattering Three Thousand Dust — Turns a Blazing Sun into fine, pervasive burning dust. 211

Sand Demon Worm King Fusion

Mu Xi fuses with the Sand Demon Worm King after reaching the Spirit Abyss Realm, obtaining a Legendary Spirit Soul and a hundred-thousand-year torso bone. 160

• Raises her Soul Power directly to level 62. 160
• Produces a full-body transformation and enables the Blazing Sun flames to reach Ultimate Fire. 160
• Allows the Sand Demon Worm King to manifest beside her in battle. 168
• Grants access to a giant sand-skeleton guardian formed from Sand Demon Worm carapace. 211

Combat Skill and Marksmanship

Mu Xi becomes an adaptable combatant rather than solely a forging specialist.

• Chains Spirit Skills effectively against stronger Spirit Beasts, using heat buildup, forced displacement, and finishing attacks. 115 116
• Uses Spirit Sea Realm spiritual power to accurately target Abyss Demon Bats with a Spirit Guidance Ray firearm despite using one for the first time. 137
• Incapacitates Blood Eight during an assessment when she judges the staged “civilian” to be a mission liability. 137
• Her main limitation is endurance; sustained high-level combat drains her quickly. 116

Forging

Mu Xi is an accomplished blacksmith who continues to develop alongside her Spirit Master cultivation.

• Demonstrates fire-element control suitable for forging from her earliest appearance. 11
• Reaches Level 6 Forging Grandmaster by age seventeen. 139
• Can forge binary Spirit-Sentient Alloy with a fusion rate above 90%, a standard exceeding ordinary Level 6 promotion requirements. 139
• Establishes a Forging Room in the Blood God Legion with Long Yuxue as investor. 141

Equipment

• One-Word Battle Armor: Jin — Directly fuses into her body rather than requiring a Storage Spirit Guidance Device; its quality is compared to the standard of Two-Word Battle Armor. 139
• Two-Word Battle Armor: Xi Jin — Forged from God Alloys exceeding 90% purity; supports her Ultimate Fire and large-scale battlefield attacks. 168 211
• Spirit Guidance Ray firearm — Used with exceptional precision in the Blood God Legion assessment. 137
• Sand Demon Worm Right Leg Bone — Given to her by Mu Ye for absorption. 133
• Sand Demon Worm King torso bone — Fuses with her during her Legendary Spirit Soul integration. 160

Relationships

• Mu Chen — Father and first forging teacher; he is strict about her training but proud of her growth. 11 13 106
• Yuan Bao'er — Mother; worries about Mu Xi's safety and cultivation while supporting her future. 57 106
• Lin Jin — Junior brother, trusted partner, and eventual romantic partner. Their bond develops from rivalry into mutual protection, shared cultivation, and Battle Armor cooperation. 11 96 106 189
• Zhen Hua — Uncle-Master; provides forging guidance and supports her advancement. 57 87 115
• Mu Ye — Senior mentor who advises her cultivation and provides the Sand Demon Worm King-related opportunity. 133
• Long Yuxue — Partner and investor in Mu Xi's Blood God Legion Forging Room. 141
• Gu Yuena — Rival; Mu Xi blocks her access to Lin Jin and defeats her in a prolonged clash. 211 212

Story Role / Major Arcs

Eastsea Academy and Lin Jin's Arrival

Mu Xi meets Lin Jin when Mu Chen introduces him as her junior brother. She challenges him to a spar, is injured by the Fire Elemental Sprite's unexpected use of Lin Jin's Spirit Skill, and receives a one-time refinement of her Soul Power and mental strength from Lin Jin's flames. 11 12 13

Spirit Ascension Platform Training

She enters the Primary Spirit Ascension Platform with Lin Jin and later joins him against a two-thousand-year Crystal Bear. Mu Xi delivers the finishing attack with Three Suns Shining and prioritizes practical combat improvement over taking the Crystal Bear's spirit power for herself. 24 26

Battle Armor Ambition

After Lin Jin shows her a Battle Armor design, Mu Xi resolves to become a Battle Armor Master. She later completes her One-Word Battle Armor and begins preparing components for Two-Word Battle Armor, including wing armor designed to suit her artillery-style combat. 96 106 111

Blood God Legion

Mu Xi enters the Blood God Legion with Lin Jin, impressing the Blood Gods through tactical judgment and firearm accuracy. Her Level 6 Forging Grandmaster status allows her to establish a Forging Room, while her combat performance overturns others' assumptions that she is only a blacksmith. 137 139 141

Sand Demon Worm King Fusion and Abyssal War

After reaching the Spirit Abyss Realm, Mu Xi fuses with the Sand Demon Worm King and rises to level 62. Armed with Ultimate Fire and Xi Jin, she becomes a major force against Abyssal Creatures, repeatedly clearing large areas with Sunset Meteor. 160 168

Conflict with Gu Yuena

Mu Xi confronts Gu Yuena at the Heaven Dou Blacksmith Association, refusing to let her meet Lin Jin. She battles Gu Yuena while wearing Xi Jin, using Ultimate Fire, Sand Demon summons, and Sunset Meteor; afterward, the battle pushes her Soul Power to level 67. 211 212

Later Cultivation

After becoming a Spirit Saint, Mu Xi prepares for eventual Four-Word Battle Armor fusion. She later enters seclusion to nourish the Fusang Divine Tree, emerging at level 76 with a radiant golden aura. 228 258

Notable Quotes

“Lin Jin is my good little brother, how could I fail to keep my own brother's secret?” 13

“Senior Sister will never be a burden to me, nor will she cause me any trouble.” — Lin Jin, defending Mu Xi 106

“You want to see A Jin, right? Fine, beat me, and I'll let you see him!” 211