Nie Yin

Biodata

Feature	Details
Name	Nie Yin (聂隐)
Alias(es)	Frog-Slaying Girl; Frog Killer
Species/Race	Thin-blooded Half-Elf; regarded as part of Du Ling's Pale Breed despite her elven ancestry 241 330
Gender	Female
Age	Bone age of 17; her exact age is unknown 241
Affiliation	Rain Institute and its Frog School; later Yuan Zhu's Anti-Law operation and Frog Factory 242 243 329
Occupation/Role	Frog School technician, frog breeder, Body Tempering Fluid producer, pollution-modification researcher, and Frog Factory worker
Status	Active 364
First Appearance	241

Background / History

Nie Yin cannot remember her life before childhood. The Rain Institute rescued her and raised her within its institutional training system, where talented orphans were prepared as technical laborers. She completed four years of basic education, audited the Frog School for three years, and remained at the Institute to work off her living and academic debts. Her sharp perception, meticulousness, and precise hands earned her placement in the Frog School despite her low status. 241 242

Her position gave her extensive theoretical training but little access to costly experiments or advanced equipment. Ostracized for her appearance and withdrawn manner, she spent her free time cleaning laboratories, observing other people's experiments, studying technical texts, and teaching herself Engraving Technique with discarded frog skins and organs. 242

Yuan Zhu interviewed Nie Yin as a prospective employee, recognizing both her practical talent and willingness to engage in taboo research. She agreed to work with him only after negotiating two simultaneous contracts: a Law Decree contract intended to protect her interests and an Anti-Law contract that imposed strict secrecy and research-rights conditions. Yuan Zhu assumed her Institute debts as part of the arrangement. 242 243

Her first major assignment was modifying a hybrid orc into a Limit Warrior. Though initially intimidated by operating on a live, unfamiliar subject, she completed the procedure and later independently performed entry-level Power Path modifications on four additional mixed-blood orcs. 248 249 280

Appearance

Nie Yin is a slight half-elf girl whose unusual features and reserved presentation contribute to her social isolation. She often conceals herself beneath a hooded cloak, which noticeably makes her more relaxed and willing to meet others' eyes. 241 245

• Long, soft, pointed ears. 241 247
• Green or emerald-green eyes; one account notes her right eye glowing. 245 246 279
• Commonly wears oversized clothing and a hooded cloak. 243 245
• Carries a delicately handmade cartoon frog wallet made from living frog skin. 243

Personality

Nie Yin is introverted, timid, and habitually avoids eye contact or direct confrontation. Years of being treated as low-status labor at the Rain Institute left her cautious, self-restrained, and slow to trust. She is nevertheless capable of asserting boundaries when necessary, as shown by her insistence on a separate Law Decree contract before joining Yuan Zhu. 242 243

She is highly pragmatic and patient about her future. Rather than committing recklessly to an extraordinary path, she treats her employment under Yuan Zhu as a way to accumulate resources, knowledge, and opportunities while preserving her own options. She initially keeps Shadow Pollution concentrated in her Uniform instead of allowing it to heavily contaminate her body. 283 296

Her quiet demeanor sharply contrasts with the confidence and focus she displays during technical work. She has a powerful thirst for knowledge, takes pride in skilled craftsmanship, and becomes animated when given a chance to demonstrate or develop a new technique. 247 303

Nie Yin also possesses a pronounced cruel streak toward weaker, defenseless creatures. Her accumulated resentment and isolation find an outlet in frog experimentation and the modification of test subjects, making her capable of clinical brutality despite her ordinary shyness. 281 303

Abilities & Skills

Frog School Skinning Ritual

Nie Yin's foundational skill is the rapid, precise skinning, beheading, and evisceration of experimental-grade frogs. Repetition since childhood has made the work instinctive and exceptionally refined. 242 247

• Produces skinned frogs with temporary quasi-extraordinary properties through the Frog God's Skinning Ritual. 242
• The material's special properties are restricted by time, location, and condition; it does not remain permanently extraordinary. 242
• Can skin and dismantle an experimental frog in under fifteen seconds. 247
• Her technique is precise enough to preserve and manipulate a frog's living functions during experiments. 247

Frog-Type Modification and Body Tempering Fluid

Nie Yin is trained in Frog School pollution modification, using Body Tempering Fluid and ritual equipment to strengthen living subjects along the Power Path. 246 249

• Assesses a subject's pollution level, physique, and compatibility before surgery. 246 248
• Extracts and refines high-concentration Body Tempering Fluid from experimental frogs. 246 247
• Successfully created a Shadow System Limit Warrior from a hybrid orc. 249
• Later completed basic Power Path modifications on five mixed-blood orcs. 280
• Can combine Frog-type Pollution with Shadow Pollution, though compatibility varies by subject and existing contamination. 282 303
• Stronger subjects require higher-quality Body Tempering Fluid, increasing the procedure's cost. 246

Viscera Divination Aptitude

Nie Yin unknowingly performs the physical requirements of Viscera Divination when dissecting frogs. The arrangement of organs created by her technique was recognized as an exceptionally natural divination diagram. 247

• Her frog dissection produces organ trajectories suitable for reading fortune and misfortune. 247
• She has no formal training in Viscera Divination and initially did not recognize the technique by name. 247
• Displays intense interest in acquiring divinatory knowledge but refuses exploitative terms attached to it. 247

Engraving, Tattooing, and Frog-Skin Crafting

Nie Yin independently studies a technical engraving art that uses tailored pigments and engraved patterns to grant special effects. 242

• Analyzes skin texture and hidden attributes through exceptional perception and steady manual work. 242
• Mixes viscera-based pigments with Five Elements effects. 242
• Can create tattoos that grant ordinary people limited extraordinary power. 242
• Can engrave prepared skins into equipment with scroll- or talisman-like effects. 242
• Pursues frog-skin tailoring, rune work, and isolation clothing as personal research beyond her debt obligations. 283 340

Anti-Law and Shadow Uniform

Nie Yin's Anti-Law contract gives her a soul-level connection to Yuan Zhu and access to Shadow-related applications. She deliberately relies on her Uniform as the main vessel for Shadow Pollution rather than deeply integrating it into her own body. 243 296

• Can perform basic manipulation of Shadow-contaminated blood and Shadow Pollution. 247
• Uses the Uniform's shadow threads to inspect unfamiliar anatomy and inject Body Tempering Fluid at targeted locations. 303
• Has four Anti-Law “downline” slots that can be used to grant opportunities or extraordinary crystals to test subjects. 316
• The contract strengthens her instinctive affinity for Yuan Zhu's Tiger Demon and Shadow-based forms. 245

Faith Practices

Nie Yin maintains a small number of long-term faith connections, treating them as practical sources of knowledge, materials, and future cultivation potential. 301

• Skilled Craftsman — improves her skinning and tailoring ability. 301
• Blood Ink — a forbidden faith used to make frog-blood ink from polluted frogs and laboratory scraps; it gave her an untrained grasp of Five Elements Ink Interpretation. 301
• Crimson Ripper — maintained as a protective backup faith capable of providing temporary enhancement. 301 302
• Flying Instant Noodle God — valued for seasoning packets that she combines with Frog School experimental waste to make frog stew. 301

Equipment / Weapons / Items

• Frog God Statue — ritual focus used in skinning, soul absorption, and Body Tempering Fluid production. 246 247
• High-concentration Body Tempering Fluid — purified Frog School enhancement reagent; one concentrated bottle can be diluted into twenty standard bottles. 246
• Qing Wei Brand Hand-Crank Yin Thunder Generator — ritual-styled hand-crank generator used during frog-processing work. 247
• Shadow Uniform — wearable vessel for Shadow Pollution, shadow threads, and anatomical exploration. 296 303
• Cartoon frog-skin wallet — an intricately sewn wallet made from several pieces of living frog skin. 243
• Surgical tools and laboratory reagents — used for frog processing, extraction, and modification procedures. 303

Relationships

• Yuan Zhu — employer and Anti-Law contract partner. He funds her research, assumes her debts, and assigns her illegal modification projects; Nie Yin remains wary of him but increasingly invests in his Shadow operation. 243 283 361
• Yuan Tang — assistant and informal student at the Frog Factory. Yuan Tang's curiosity and admiration encourage Nie Yin to teach frog experimentation enthusiastically. 314 329
• Senior Sister Chen — senior researcher who shares ideas concerning Frog School materials and dangerous-botany applications; Nie Yin quietly considers her proposals. 285
• Rain Institute — the institution that raised, trained, indebted, and employed Nie Yin before Yuan Zhu hired her. 241 242
• Frog School — her technical training background and the source of her expertise in frog rituals, reagents, and modification procedures. 242 246

Story Role / Major Arcs

Recruitment into Anti-Law

Nie Yin enters the story as an isolated Frog School laborer seeking a sponsor for her self-directed research. Her interview with Yuan Zhu reveals her technical ability, ambition, and contractual caution, ending with her formal employment under Anti-Law. 241 243

Limit Warrior Experiments

After smuggling Frog School supplies for Yuan Zhu, Nie Yin demonstrates her methods on a hybrid orc. She overcomes her fear of live modification, successfully creates a Limit Warrior, and becomes responsible for further Power Path research and care of the altered subjects. 245 248 249

Frog Factory Development

Given authority over the warehouse and its orcs, Nie Yin refines her practical experience by completing further modifications and producing reagents. Her work becomes central to Yuan Zhu's plans for frog breeding, pharmaceutical production, muscle modification, and the Frog Factory. 251 279 280

Shadow Modification Research

Nie Yin experiments with combining Frog-type and Shadow Pollution, including the development of Shadow-type Muscular Goblin Strongmen. The Shadow Uniform expands her ability to study nonhuman anatomy and conduct more precise modifications. 282 303

Integration into Yuan Zhu's Domain

After seeing the resources and purity of Yuan Zhu's Mountain Lord Domain, Nie Yin becomes more committed to developing Anti-Law Shadow rather than treating it solely as a temporary springboard. Yuan Zhu hints that she may eventually receive a position comparable to a mountain god. 361

Trivia

• Nie Yin becomes visibly more comfortable when wearing a hooded cloak; it gives her a strong sense of security. 245
• She considers skinning a livelihood rather than a hobby and reacts coldly to anyone who calls it one. 242
• Her frog-skin wallet demonstrates exceptionally delicate hand-sewing and a deliberately cute design despite its unsettling materials. 243
• Her social skills are poor even after becoming a Frog Factory technician, but she can negotiate effectively when dealing with familiar Rain Institute personnel. 251 326