Snape

Biodata

Feature	Details
Name	Severus Snape
Species/Race	Wizard
Gender	Male
Affiliation	Formerly Hogwarts School of Witchcraft and Wizardry; former Death Eater who returns to Voldemort’s service under DeSantis’s pressure 325 502
Occupation/Role	Potions Master; formerly Hogwarts Potions professor and Head of Slytherin House; chief examiner for the Potions Exchange selection assessment 399. His defection leaves the Potions teaching post vacant 502
Status	Defected from Hogwarts by the aftermath of Voldemort’s resurrection 502
First Appearance	Chapter 17

Background

Snape was born to Eileen Prince, a pure-blood witch, and an abusive Muggle father. The collapse of his parents’ relationship and the absence of family photographs at Spinner’s End suggest that this childhood continued to affect him deeply as an adult 65.

He was formerly a Death Eater and retained the Dark Mark. After Lily Evans’s death, his former ambitions, resentment, and ideals were replaced by grief, regret, and his continued attachment to Lily’s memory 103 111. Dumbledore used Snape’s feelings for Lily to compel him into serving as a spy, a coercion Snape never forgave 50 203.

At Hogwarts, he served as Potions Master and Slytherin’s Head of House. Dumbledore assigns him to watch Harry Potter and, reluctantly, Vaughan Weasley, whose powerful wand and concealed nature concern the Headmaster 17.

Vaughan later argues that Dumbledore’s defense of Snape served several strategic purposes beyond mercy: monitoring pure-blood families, protecting Lily’s son, and retaining a possible route back into Voldemort’s confidence. Dumbledore acknowledges the cruelty of his calculations while invoking Snape’s own past in response 383.

Following Voldemort’s resurrection and the crisis in the Chamber of Secrets, Snape’s defection leaves Hogwarts without a Potions professor. Vaughan considers Horace Slughorn the best available replacement 502.

Appearance

Snape is a tall, imposing wizard whose deliberately ominous presence unsettles students.

• Long, greasy black hair, sometimes hidden beneath a hood 17 242
• Hooked nose and harsh, icy expression 17
• Lifeless black eyes frequently compared to those of a venomous snake 22
• Dark, trailing professor’s robes and leather shoes 17
• Pale complexion after strenuous Legilimency 83

Personality

Snape is intensely private, impatient, and cuttingly sarcastic. He seldom wastes words, prefers harsh practicality to reassurance, and uses mockery to dominate his classrooms and conceal emotional vulnerability 17 83.

His hostility toward Harry is rooted in the conflict between Harry’s resemblance to James Potter and his eyes, which remind Snape of Lily Evans. This contradiction repeatedly destabilizes his composure: he despises Harry, yet remains fiercely concerned for his safety 17 123 288.

Despite his cynicism, Snape is capable of loyalty and professional pride. He supports Vaughan’s potion research, takes satisfaction in Vaughan surpassing him, and eventually agrees to assist the Dueling Club as its Potions instructor while dismissing it as “childish” and meaningless 44 312.

His professional standards can conflict with his ideological objections. Although angered by Vaughan’s use of Muggle-derived knowledge, he respects objective results in potion-making and cannot honestly deny that the experiments have succeeded 351.

His sarcasm remains prominent during the Potions Exchange selection assessment. When Harry and Ron’s potions transform them into girls, he mocks them as “Miss Potter” and “Mrs. Weasley” while formally failing them and Hermione 401. He is equally cynical about negotiations between Vaughan and Dumbledore, privately regarding them as an old fox and a young fox, neither of whom is any good 404.

Snape’s contempt for Muggles also appears in his response to the violent scenes in the students’ film about Harry’s first-year trial. He dismisses McGonagall’s concerns by distinguishing wizards from “weak Muggles” and argues that exposure to some brutality will not harm the students 129.

He reacts punitively but adaptively when Ron successfully predicts assessment topics: he deducts fifty points from Gryffindor and changes the examinations for the remaining years rather than continuing with the exposed approach 403.

Abilities & Skills

Potions

Snape is a Potions master and an exacting instructor with extensive knowledge of potion ingredients, formulae, and brewing safety.

• Teaches Hogwarts Potions and harshly penalizes mistakes, particularly from Gryffindor students 21 23
• Brews advanced potions such as Draught of Living Death and Felix Felicis 49 169
• Recognizes the potential of Vaughan’s Magic Extraction Method and helps test, develop, and refine it 26 44
• Assists Vaughan’s recovery from the Snake Kiss curse 123
• Questions the cost, ingredient requirements, and Polyjuice-derived basis of Vaughan’s Protein Transfiguration Potion 351
• Successfully separates the properties of several potion ingredients using the Magic Extraction Method and agrees to support its further development 26
• Helps Vaughan begin werewolf potion experiments by taking him to meet werewolves in Knockturn Alley; afterward, recounts the Wolfsbane Potion’s development to Dumbledore 64 67
• Supplies Vaughan with Felix Felicis during his North American trip. Vaughan sends him probability calculations concerning its effects and requests at least three more ounces for further data collection 169
• Serves as chief examiner for the Potions Exchange selection assessment and announces Polyjuice Potion as the examination subject for Harry and Ron’s year 399
• Agrees to procure supplies for Vaughan through his contacts despite having none in stock himself, shortly after their dispute over magical-protein research 353
• Revises the remaining selection examinations to use actual O.W.L. and N.E.W.T. questions after Ron’s predictions help nearly half the fourth-year candidates pass; the sixth-year candidates perform particularly poorly 403

Dark Magic

Snape is recognized as a Dark Magic master who developed Sectumsempra while still a student 16.

• Understands the emotional requirements and psychological dangers of Dark magic 16
• Teaches Vaughan Sectumsempra alongside advanced spells including the Reductor Curse and Disillusionment Charm 47
• Uses the Petrification Charm against Harry when confiscating the diary 235
• Demonstrates overwhelming magical pressure while confronting Lucius Malfoy and DeSantis near the lake 324
• Formerly served Voldemort and is later pressured into returning to Voldemort’s service through DeSantis’s intervention 325

Vaughan initially regards Snape as a potential Dark Magic mentor because he is proficient in the discipline without displaying the madness Vaughan associates with its abuse 16.

Legilimency and Occlumency

Snape is skilled in both mind-reading and mental defense.

• Nearly loses control of his Occlumency when Dumbledore invokes Lily’s eyes in Harry 17
• Teaches Harry Occlumency through prolonged, forceful Legilimency assaults 83
• Sustains a mental battle with Harry for more than an hour, leaving both of them physically exhausted 83
• Harry is warned that Snape may use Legilimency if given the opportunity 326

Patronus Charm

Snape’s Patronus takes the form of a doe, reflecting his enduring love for Lily Evans 111.

• Uses a Patronus message to receive urgent information from Dumbledore 49
• The Patronus’s form triggers memories of Lily and causes Snape to openly weep in private 111

Protective Intervention

Although his methods are often cruel or indirect, Snape repeatedly acts to protect Harry and other students.

• Is believed to have saved Harry when Dark magic interfered with Harry’s broom during Quidditch 62
• Confronts Quirrell in the Forbidden Forest over the Philosopher’s Stone and Hagrid’s monster 82
• Secretly sends Harry and Draco away from DeSantis’s presence before confronting the danger 324
• Uses a false theft accusation and detention to keep Harry from being alone during the Halloween danger surrounding the diary 288

Mentorship and Research Access

Snape’s assistance to Vaughan extends beyond direct instruction and brewing.

• Authorizes Vaughan to consult advanced books in the Restricted Section, giving him early access to sophisticated spells, Dark magic, and potion formulae 32
• Bargains with Vaughan over joining the Slytherin Quidditch team to defeat Harry, granting resources and privileges in exchange for participation 34
• Supports Vaughan’s Dueling Club alongside the other Heads of House during a dispute with the Board of Governors, drawing Alecto Carrow’s contempt 317

Power Progression

Stage / Period	Documented Development or Demonstration	Citation
Student years	Develops Sectumsempra while still at school, establishing an early record of advanced Dark Magic invention.	16
Established Hogwarts career	Is recognized as both a Potions master and a Dark Magic master; already possesses Occlumency when assigned to monitor Harry and Vaughan.	16 17
Magic Extraction research	Successfully applies Vaughan’s Magic Extraction Method to separate ingredient properties and undertakes further collaborative development.	26 44
Advanced instruction of Vaughan	Teaches Vaughan the Reductor Curse, Disillusionment Charm, and Sectumsempra.	47
Harry’s Occlumency training	Demonstrates sustained Legilimency through a mental confrontation lasting more than an hour.	83
Patronus revelation	His corporeal Patronus is revealed to be a doe, reflecting his attachment to Lily.	111
Confrontation with DeSantis	Displays formidable magical pressure while protecting Harry and Draco and confronting Lucius and DeSantis.	324
Evaluation of magical-protein research	Identifies the Polyjuice-derived basis of Vaughan’s Protein Transfiguration Potion and assesses its production requirements and costs.	351
Potions Exchange assessment	Demonstrates broad examination expertise by revising selection tests to actual O.W.L. and N.E.W.T. questions after Ron predicts his original topics. No new magical advancement is stated.	403

Relationships

• Albus Dumbledore — Headmaster, handler, and longtime source of resentment. Snape serves Dumbledore but believes he manipulates children and hides behind “fate” 50 232. Vaughan later challenges Dumbledore over his use of Snape as a watcher of pure-blood families, Harry’s protector, and a potential intermediary to Voldemort; Dumbledore acknowledges the calculating nature of his treatment 383. Snape remains openly distrustful of Dumbledore’s bargains with Vaughan 404.
• Harry Potter — Student and the son of Snape’s former rival. Snape’s hostility toward Harry conflicts with his need to protect Lily Evans’s son 17 83 288. After learning about Snape and Lily from Vaughan, Harry begins to regard him with pity, and later worries intensely about his safety following the confrontation with DeSantis 123 326. Snape nevertheless continues to humiliate Harry, including during the Potions Exchange selection assessment 401. Harry subsequently suspects that Snape is helping Death Eaters resurrect Voldemort and attempts to investigate him independently 402 482.
• Lily Evans — Snape’s deepest emotional attachment. Her death reshaped his life, Patronus, and loyalty 111 123. His encounter with the Mirror of Erised also exposes his continuing longing for her 68.
• Vaughan Weasley — Potions student and research collaborator. Snape mentors Vaughan, supports his Magic Extraction research, and regards him as his favorite student despite frequent irritation 24 26 80. He also teaches Vaughan advanced spells and supplies Felix Felicis for his research 47 169. Their scientific collaboration becomes strained over Vaughan’s integration of Muggle knowledge into potion-making 349 351. Nevertheless, he agrees to obtain supplies for Vaughan shortly after their disagreement 353. Following Snape’s defection, Vaughan considers who should replace him as Potions professor 502.
• Quirinus Quirrell — Snape threatens Quirrell over the Philosopher’s Stone, leading Harry to initially suspect Snape of villainy 82.
• Lucius Malfoy — Former associate and Draco’s father. Their secret meeting is disrupted when Lucius activates the Dark Mark and brings DeSantis into Hogwarts 322 324. Lucius later discusses Snape and the secret North American visitors with Jacob Rosier, revealing suspicion of him 383. During the international feast, Lucius uses a public confrontation with Vaughan as a pretext to leave with Snape and Rosier, then boasts that Snape was present as backup 385.
• Draco Malfoy — Snape is Draco’s godfather and one of Lucius Malfoy’s closest confidants 322. When Draco warns Harry about his father’s involvement in Voldemort’s resurrection, he deliberately withholds Snape’s involvement to protect his godfather 437.
• Isabella Rosier — Fellow Hogwarts professor with whom Snape has a contentious relationship. They fight on the night the diary is stolen from his office, and her later classroom remarks prompt Harry to wonder how badly Snape humiliated her as a student 242 253. Her enthusiastic ceremonial introduction of him as chief examiner irritates him, and he cuts it short to begin the assessment 399.
• Voldemort — Snape’s former master. He once served Voldemort as a Death Eater and is later compelled toward renewed service under DeSantis’s influence 124 325. His history with Voldemort also makes him valuable to Dumbledore’s plans surrounding Voldemort’s return 383. By the aftermath of Voldemort’s resurrection, Snape has defected from Hogwarts 502.
• Ron Weasley — Student and frequent target of Snape’s hostility. Snape mocks Ron’s female transformation as “Mrs. Weasley,” then deducts fifty Gryffindor points after Ron sells successful predictions of the selection examination topics 401 403.
• Fawkes — Dumbledore’s phoenix resents Snape for collecting its feathers and blood during rebirth without offering compensation or care. Snape dismisses the resulting grievance and covers Fawkes before it can screech at him during a visit to Dumbledore’s office 111 194.
• Horace Slughorn — Considered by Vaughan as the best available successor to Snape after his defection leaves the Potions teaching position vacant 502.

Story Role / Major Arcs

First-Year Surveillance and the Philosopher’s Stone

Dumbledore orders Snape to monitor Harry and Vaughan. In Potions lessons, Snape publicly humiliates Harry while recognizing Vaughan’s exceptional ability and awarding Slytherin points for his improved boil-curing potion 17 22 23.

Vaughan requests private instruction from Snape, who agrees. Their partnership develops when Snape successfully applies Vaughan’s Magic Extraction Method and commits resources to its further development 24 26.

Snape also authorizes Vaughan’s access to advanced Restricted Section books, enabling him to study spells and potions that would otherwise remain beyond his usual school curriculum. Later, his desire to see Harry defeated in Quidditch gives Vaughan leverage to negotiate resources and privileges in exchange for joining Slytherin’s team 32 34.

The mentorship extends beyond brewing: Vaughan learns the Reductor Curse, Disillusionment Charm, and Sectumsempra from him 47. Snape also objects to Dumbledore’s involvement of Vaughan in his plans for Harry, accusing the Headmaster of potentially cultivating another useful subordinate or double agent 49.

After the first-year trial is adapted into a film, Snape rejects McGonagall’s concern about its brutality. He knows both Dumbledore’s whereabouts and his plan with Vaughan but does not explain them to her during their discussion 129.

Wolfsbane Potion Research

Snape helps Vaughan arrange access to werewolves for potion experiments, taking him to Knockturn Alley and providing guidance during the early research. Their discussions address the potion’s purpose and limitations, and Snape shows an unusual degree of concern for the werewolves’ circumstances 64.

He subsequently reports the Wolfsbane Potion’s development to Dumbledore, including Vaughan’s contrasting treatment of Greyback’s followers and wandering werewolves. This account contributes to Dumbledore’s reassessment of Vaughan’s character and ambitions 67.

Harry’s Occlumency Training

When Voldemort’s influence begins affecting Harry’s mind, Dumbledore assigns Snape to teach Occlumency despite both teacher and student objecting. Their lessons become punishing mental duels driven by mutual dislike, though Harry ultimately masters Occlumency and ends the training 82 83 90.

The Diary and Fate’s Backlash

Snape confiscates Harry’s enchanted diary after catching Harry and Ron insulting him. His attempt to interfere with the diary’s path draws Dumbledore’s warning that fate will retaliate, followed immediately by Snape falling down a staircase 234 235.

The diary is later stolen from his office on a night when he also fights with Isabella Rosier. He suspects student involvement but cannot establish who took it 242.

He later tries to keep Harry away from the diary’s dangers by arranging punitive detention, but clashes with Vaughan and Dumbledore over their apparent inaction 288.

DeSantis and the Unbreakable Vow

Snape confronts Lucius Malfoy after Lucius activates the Dark Mark and leads him to DeSantis. He protects hidden Harry and Draco before facing the unknown dark wizard, then chooses to serve Voldemort again under DeSantis’s pressure 324 325.

Afterward, Snape remains secretive and constrained by an Unbreakable Vow, communicating with Vaughan through indirect hints rather than direct answers 327.

The encounter alters Harry’s view of him. Harry repeatedly recalls Snape’s intervention and worries that he might not return safely after allowing Harry and Draco to escape 326.

Conflict over Vaughan’s Potion System

Snape reacts bitterly to Vaughan’s proposal to transform potion-making through a universal functional group and Muggle-derived scientific methods. Though he cannot deny the research’s results, he sees the incorporation of Muggle knowledge into magical potions as a betrayal of wizarding magic 349 351.

He scrutinizes the feasibility of producing the new material, recognizing that Vaughan’s Protein Transfiguration Potion derives from Polyjuice Potion and questioning the enormous ingredient costs and reliance on Felix Felicis 351.

The disagreement does not immediately end their practical cooperation. Vaughan visits Snape’s office after an experiment and secures his agreement to purchase needed supplies through his contacts, surprising Hermione, who had expected his hostility to prevent such assistance 353.

Dumbledore’s Plans for Voldemort’s Return

While Snape is absent, Vaughan and Dumbledore discuss the former Death Eaters who might regain Voldemort’s trust. Vaughan identifies Snape as a likely component of Dumbledore’s preparations and argues that the Headmaster has preserved his usefulness through his family connections, attachment to Lily, and former allegiance 383.

Dumbledore does not deny the cruelty of this reasoning. The exchange places Snape’s past and loyalties at the center of the wider effort to influence the circumstances of Voldemort’s return 383.

During the international feast, Lucius publicly accuses Vaughan of using the Potions Exchange to undermine the International Statute of Secrecy. Jacob Rosier claims Lucius is drunk and escorts him out with Snape. Outside, their conversation reveals that the confrontation was an excuse to leave the feast; Lucius boasts that Snape was available as backup. Harry notices their departure and persuades Ron and Hermione to follow 385.

Potions Exchange Selection Assessment

Snape acts as chief examiner for the year-by-year selection assessment associated with the Potions Exchange. Irritated by Isabella Rosier’s enthusiastic introduction, he dispenses with the ceremony and announces that Harry and Ron’s year will be assessed on Polyjuice Potion 399.

Harry and Ron enter the examination intending to perform badly to avoid selection. Their potions transform them into girls, prompting Snape’s mocking names, “Miss Potter” and “Mrs. Weasley.” Hermione’s potion causes uncontrolled hair growth; although she quickly prepares an antidote using the Essence Charm, Snape formally fails all three 399 401.

Ron subsequently sells predictions of the remaining examination topics, drawing on potions discussed in Vaughan’s published papers. His predictions help nearly half the fourth-year candidates pass. Snape deducts fifty points from Gryffindor and replaces the other years’ examinations with actual O.W.L. and N.E.W.T. questions, producing especially poor sixth-year results 403.

Vaughan and Dumbledore visit Snape afterward and tease him about Ron’s success. Vaughan shields the office against outside observation and eavesdropping with Qimen Dunjia before pressing Dumbledore to accept his final condition for their agreement 403.

Snape later witnesses a negotiation between Vaughan and Dumbledore with evident contempt. He demands that their discussion concern him, but Vaughan does not explain and instead presents Dumbledore with a parchment containing the answer he wants 404.

Renewed Diary Investigation and Defection

Harry and Ron suspect that Snape is cooperating with Death Eaters to resurrect Voldemort. Unable to persuade Vaughan or Dumbledore to intervene as they wish, they resolve to investigate independently, while Hermione conceals her knowledge of the wider plan 402.

Snape later supervises preparations for the Potions Exchange’s second stage, leaving his students a study period with Draco in charge. During this period, Draco privately warns Harry that the resurrection plot involves the diary. Although he reveals his father’s involvement, Draco deliberately conceals Snape’s part to avoid endangering his godfather 436 437.

As Colin Creevey goes missing, Harry fears that an official school search will make it harder to stop Snape: his position as a Hogwarts professor would give him an overwhelming advantage over the students’ independent investigation 482.

By the aftermath of Voldemort’s resurrection and the Chamber of Secrets crisis, Snape has defected, leaving Hogwarts’ Potions teaching post vacant. Vaughan weighs the advantages and risks of recruiting Horace Slughorn, rejects using him as bait for Voldemort, and concludes that he is the best available replacement 502.

Notable Quotes

“I only wanted to see how he'd get himself killed!” 80

“Enough!” 17

“Then ten minutes, Potter. Do you have any other objections?” 83

“What you're discussing had better concern me.” 404

“Dumbledore, great White Wizard, wasn't ruining me enough for you? You had to drag Vaughn into this too?” 49

“They are wizards, not weak Muggles. Exposure to a little brutality will do them no harm.” 129

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