Slytherin

Biodata

Feature	Details
Name	Salazar Slytherin (斯莱特林)
Alias(es)	Slytherin; Slytherin's ghost
Species/Race	Wizard; later existed as a ghost before being resurrected
Gender	Male
Affiliation	Hogwarts; one of the Four Founders
Occupation/Role	Founder, Dark Magic researcher, combat instructor, creator of Slytherin's legacy and trials
Status	Alive; resurrected in a new physical body 496
First Appearance	Chapter 233, as a ghost 233

Existence and Physical State

State	Chapter	Notes
Ghost	233	Awakens in the Wizard Tower and confronts Li Weide; initially unable to physically interact with the world. 233
Magic-capable ghost	262–263	Li Weide creates an Obscurus-based robe that lets him sense and wield magic again; its power supply limits prolonged high-intensity combat. 262 263
Temporary physical shell	277	A modified Obscurus garment grants him solidity, touch, smell, and spellcasting, but prevents ghostly wall-passing and does not let him eat. 277
Resurrected wizard	496	Li Weide offers him a new body; after initially intending to die, Slytherin accepts and chooses to live again. 496

Background

Slytherin was born into a powerful pure-blood family renowned for Dark Magic. As a youth, he had access to rare inherited knowledge such as Legilimency and was already inclined to view vigilance, control, and magical strength as necessities. 564 566

In the sequence depicting the founders before Hogwarts' establishment, Slytherin studied under Li Weide alongside Gryffindor, Ravenclaw, and Hufflepuff. When the group discussed their future school, he defined his preferred students as shrewd and highly ambitious elites, rejecting mediocrity above all else. 565 570

Slytherin built hidden facilities beneath Hogwarts, including a study with trials intended to temper his descendants under his supervision. His surviving materials show that he annotated worthy students' work, but also conducted brutal Dark Magic and Obscurial experiments, including tests on Muggles. 215 216 256

He left behind a Basilisk and a secret chamber connected to Parseltongue mechanisms, as well as extensive research on curses, Magical Creatures, and the Blood Moon Curse. 218 225 245

His apparent death ultimately traced back to an expedition into the Great Tomb. The group later concludes that a consciousness body sealed within the tomb used Slytherin as a host or test subject, separating his soul from a body that may have remained alive for over a millennium. 275 276 485

Appearance

As a ghost, Slytherin appears as a milky-white, translucent man, usually dressed in dark clothing and carrying a crooked wand. Once supported by Obscurus magic, he can appear nearly indistinguishable from a living person apart from his pale complexion. 234 277

• Translucent ghostly form before receiving Li Weide's Obscurus garment. 262
• Black wizard robes formed from Obscurus magic. 262
• Pale but otherwise lifelike appearance while using his modified physical shell. 277
• Often wears a hood or headscarf while concealing his identity during travels. 385 477

Personality

Slytherin is proud, suspicious, sharp-tongued, and intensely conscious of status. He considers himself an elite among wizards and dislikes being challenged, especially by someone younger or of lower social standing. His pride is repeatedly wounded by Li Weide's refusal to treat him with the reverence normally afforded to a Hogwarts Founder. 237 262

His original worldview is rooted in pure-blood supremacy, distrust of Muggles, and the belief that fear is necessary to secure safety. He regards ruthless conduct as a product of his violent era, where defeat could mean death. 236 263

Despite this, Slytherin respects exceptional ability even when it comes from people he initially disdains. Li Weide's talent gradually forces him to reconsider bloodline prejudice, and he eventually states that pure-blood ideology should be buried with the past—though he retains personal resentment toward descendants who married Muggles. 256 278 475

He is capable of mentorship and attachment. He takes a personal interest in Tom Riddle's potential, shows concern for Helena Ravenclaw, and becomes increasingly willing to cooperate with Li Weide when their interests align. 240 257 386

Abilities & Skills

Dark Magic

Slytherin is an exceptionally dangerous Dark wizard with a broad command of ancient and modern curses.

• Conjures cursed black mist that transforms into venomous insects; contact with the insects immediately inflicts curses. 233
• Can control Fiendfyre well enough to contest Li Weide's Fiendfyre in direct combat. 234
• Uses lethal curses, including the Killing Curse, to force opponents into predictable movements. 263
• Learns vicious later-era Dark Magic quickly, including a curse that melts a target into cursed black sludge. 275
• His Obscurus-supported magic is finite; continuous ordinary combat can last days, but his old high-output style reduces the duration to roughly twelve hours. 263

Combat Tactics

Slytherin's fighting style prioritizes survival and victory over restraint, etiquette, or collateral damage.

• Uses unavoidable or deadly spells to narrow an opponent's available responses and seize control of the battle. 263
• Employs feints and mismatched spoken incantations to mislead opponents about the spell actually being cast. 314
• Teaches Li Weide to treat combat as a fight to the death rather than a regulated duel. 263
• Can use Apparation tactically, though skilled enemies may anticipate his destination. 478

Magical Research and Instruction

Slytherin is both a researcher and an experienced teacher.

• Personally annotated students' written work in his study, demonstrating that he taught students he considered worthy. 216
• Researched Dark curses, Obscurials, the Blood Moon Curse, and magical immortality. 216 256 257
• Created and understood the Basilisk Pupil Curse and later advised Li Weide on Basilisk-related research. 245
• Oversees the successful breeding of adult Basilisks in Africa using Li Weide's nutrient solution. 385 475
• Provides Li Weide with anti-magic rune knowledge for enhancing Muggle weapons. 263

Parseltongue and Legacy Magic

Slytherin's magical legacy is closely tied to serpents and bloodline-locked mechanisms.

• Can speak Parseltongue; his descendants are associated with the ability as well. 72
• Designed secret entrances and trials that require Parseltongue or a Slytherin descendant to access. 225
• Created a wand that could only be used by his descendants and could be commanded into dormancy through Parseltongue. 475

Adaptation to Modern Magic

After awakening, Slytherin proves unusually capable of adapting despite being from another era.

• Learns later-era spells despite the implication that ordinary ghosts cannot acquire new knowledge. 275
• Learns to sever the magic circuit of his Obscurus garment temporarily to regain ghostly wall-passing. 352
• Initially dismisses automated defensive equipment, then acknowledges the value of Li Weide's Protective Watch after it saves him from Cain's Killing Curse. 478
• Reflects on Muggle technological advancement and begins reconsidering his old assumptions about Muggles. 280

Equipment and Items

• Slytherin's Wand — Horned Serpent Wood with a Basilisk horn core; restricted to Slytherin descendants and vulnerable to Parseltongue commands. 475
• Obscurus garment — A magical robe created and improved by Li Weide that grants Slytherin solidity and access to magic. 262 277
• Protective Watch — Li Weide's automated defensive device; deploys rotating metal plates that can block lethal attacks. 478
• Horned Serpent Wood branch — Acquired from the tree that grew from the burial site of Slytherin's original wand. 477
• Basilisk research and breeding materials — Used while overseeing the Basilisk breeding project in Africa. 385 475

Relationships

• Li Weide — Initially enemies in a magical duel, then reluctant partners bound by Li Weide's terms. Li Weide restores his ability to cast magic, helps him gain a physical body, and ultimately resurrects him; Slytherin becomes both an adviser and student of Li Weide's ideas. 233 237 277 496 565
• Tom Riddle — His surviving British descendant. Slytherin is frustrated by Tom's rejection of Dark Magic but recognizes his rare talent, trains him through duels, and takes pride in his resourcefulness. 236 240 314 386
• Helga Hufflepuff — Fellow Founder and old friend. Their reunion reveals that Hufflepuff was tasked with waiting for Slytherin's resurrection and then beginning a larger mission. 373 497
• Godric Gryffindor — Fellow Founder, close friend, and frequent rival. Their tendency to duel and insult one another persists after their reunion. 500 565
• Rowena Ravenclaw — Fellow Founder; Slytherin retains ties to her family through Helena and supports the recovery of Ravenclaw's Diadem. 256 257
• Helena Ravenclaw — Former student and the daughter of Rowena Ravenclaw. Slytherin reacts with anger and regret upon learning of her murder, and seeks to punish the Baron for it. 256 257
• Albus Dumbledore — A respected modern wizard who accepts Slytherin's existence and later consults him about teaching Dark Magic at Hogwarts. 277 364
• Cain — A vampire who possesses Slytherin's original body and claims access to all of Slytherin's knowledge. Their conflict is driven by Slytherin's desire to reclaim his identity and prevent Cain from devouring his soul. 477 478

Story Role and Major Arcs

Awakening and Confrontation

Slytherin awakens as a ghost in the Wizard Tower and immediately challenges Li Weide over his perceived Muggle-born status. Their clash escalates into a Fiendfyre duel before Li Weide forces him to confront the consequences of his bloodline ideology and the decline of the Gaunt family. 233 234 236

Bargain with Li Weide

Unable to act freely as a ghost, Slytherin enters an unequal but mutually beneficial arrangement with Li Weide. He provides knowledge of ancient magic, Dark Magic, Basilisks, and curses, while Li Weide gradually gives him ways to interact with the physical world. 237 245 262

Physical Restoration and Modernization

Li Weide's Obscurus research enables Slytherin to cast magic, touch objects, and eventually travel outside Hogwarts. During this period, Slytherin becomes a combat instructor, learns modern spells and equipment use, and begins reassessing parts of his old worldview. 263 275 277 280

Basilisk Breeding Project

Slytherin agrees to manage Li Weide's Basilisk breeding operation in Africa after Li Weide offers benefits for Tom and access to purified magic power. The project successfully produces adult Basilisks suitable for material collection. 385 386 475

Search for His Wand and Battle with Cain

Seeking the descendants of Isolt Sayre and the remains of his wand, Slytherin travels to America and reaches Ilvermorny. There he encounters Cain, a vampire using Slytherin's original body; their battle reveals Cain possesses Slytherin's knowledge and talent. 475 477 478

Resurrection and the Founders' Mission

After learning that his death was linked to the Great Tomb, Slytherin eventually accepts Li Weide's offer of a new body. His resurrection reunites him with Hufflepuff and places him within the mission left by their teacher: to obey the bearer of a Black Badge when the time comes. 485 496 497

Notable Quotes

“In my era, failure meant death. To survive, what methods could not be used?” 263

“I don't like stupid students. They had best be shrewd, and they must have great ambitions!” 570

“Only a deal proposed by me can be most beneficial to me.” — responding to Li Weide's negotiating style with recognition and approval. 237