Sebastian Sallow in Hogwarts Legacy: Complete Character Guide & Quest Walkthrough

Sebastian Sallow is one of the most compelling companion characters in Hogwarts Legacy, offering players a dark, morally complex questline that explores forbidden magic and personal tragedy. His storyline isn’t just another side quest, it’s a deep jump into the Unforgivable Curses, family loyalty, and choices that genuinely impact how you see your character’s journey through the wizarding world.

Whether you’re trying to unlock all three Unforgivable Curses, debating whether to turn him in after his final quest, or just want to maximize your friendship with the ambitious Slytherin, this guide covers everything you need to know. We’ll walk through every quest in his storyline, break down the consequences of major decisions, and clarify what you can (and can’t) do with Sebastian by the time the credits roll.

Who Is Sebastian Sallow?

Character Background and Personality

Sebastian Sallow is a fifth-year Slytherin student you’ll meet early in Hogwarts Legacy. He’s sharp, ambitious, and carries himself with the kind of confidence that either draws you in or sets off alarm bells, sometimes both. Unlike many students content to coast through classes, Sebastian is obsessed with finding a cure for his twin sister Anne, who suffers from a mysterious curse that leaves her in constant pain.

His desperation drives him toward increasingly dangerous research into Dark Arts, and he’s not shy about bending (or breaking) school rules to get what he wants. Sebastian believes the ends justify the means, which puts him at odds with his uncle Solomon and, eventually, with moral boundaries most wizards won’t cross. He’s charismatic and loyal to those he trusts, but his single-minded focus on saving Anne makes him reckless.

You’ll spend a lot of time with Sebastian if you pursue his questline, and his personality shifts from charming study partner to someone willing to use Unforgivable Curses without hesitation. It’s one of the better-written character arcs in the game, and it doesn’t pull punches about where obsession can lead.

Sebastian’s Role in the Main Story

Sebastian isn’t required for the main story completion, but his questline is one of the most substantial companion arcs in Hogwarts Legacy. He’s introduced during Defense Against the Dark Arts class and quickly becomes a recurring presence if you accept his invitations to explore his personal investigations.

His story runs parallel to your own journey with Ancient Magic, but it’s darker and more grounded. While you’re dealing with goblin rebellions and Ranrok’s plans, Sebastian is hunting down forbidden texts, sneaking into restricted areas, and pushing the limits of what’s considered acceptable magic. The two storylines occasionally intersect, he’ll offer help during certain main quests, and some of his own missions tie into locations you’ll visit anyway.

By the time you reach the endgame, Sebastian’s arc will have concluded independently of the main plot. Your choices during his questline don’t alter the final boss fight or the overall ending, but they do shape Sebastian’s fate and whether certain spells remain available to you. It’s a separate thread, but it’s easily the most memorable companion content in the game.

How to Unlock Sebastian Sallow’s Questline

Meeting Sebastian: Your First Encounter

You’ll meet Sebastian Sallow automatically during your first Defense Against the Dark Arts class with Professor Hecat. This happens shortly after you’ve settled into Hogwarts and completed the initial tutorial sections. Sebastian is your dueling partner during the class, and the game uses this moment to introduce his competitive, confident personality.

After class, he’ll approach you and mention the Undercroft, a secret location he wants to show you. Accepting his invitation starts his questline and unlocks access to one of the game’s most useful hidden areas. You can’t miss this encounter: it’s part of the mandatory class progression, but you can delay following up on his invite if you want to focus on other activities first.

Prerequisites and Requirements

Sebastian’s full questline doesn’t have level gates, but some missions won’t trigger until you’ve progressed far enough in the main story. In the Shadow of the Undercroft becomes available immediately after your first meeting, but subsequent quests in his arc are time-gated by main story milestones.

You’ll need to complete certain main quests, usually tied to your relationship with Professor Fig and your exploration of Ancient Magic sites, before Sebastian’s next mission pops up. The game doesn’t always make this clear, so if you’re waiting for his next quest, push forward with the main storyline. There’s no specific level requirement, but you’ll naturally be around level 12-16 by the time you’re midway through his arc.

One thing to note: Sebastian’s questline is entirely optional. You can ignore his invitations and still complete the game, but you’ll miss out on learning the Unforgivable Curses and one of the most narratively rich storylines in Hogwarts Legacy. Performance reviews from Eurogamer and other outlets consistently highlight his arc as essential content, even if the game doesn’t force you to do it.

Complete Sebastian Sallow Quest Guide

In the Shadow of the Undercroft

This is Sebastian’s introductory quest and your first real taste of his rebellious streak. He takes you to the Undercroft, a hidden chamber beneath Hogwarts that he and his friend Ominis Gaunt use as a private practice space. It’s a massive, atmospheric room with plenty of space for spell practice and, later, your own customization.

Sebastian teaches you a few combat tricks here and tests your dueling skills. The mission is straightforward, learn some spells, practice combat, and get a sense of Sebastian’s personality. There’s no moral weight yet: it’s all setup. The Undercroft becomes a permanent fast-travel point and a useful place to practice spells or complete combat challenges without distractions.

In the Shadow of Discovery

Sebastian’s obsession with curing Anne begins to show here. He’s heard rumors of a powerful relic hidden in the Restricted Section of the library and convinces you to help him break in after hours. This is your first glimpse of how far he’s willing to go, sneaking into forbidden areas, lying to authority figures, and risking expulsion.

The mission involves stealth, some light puzzle-solving, and a tense sequence where you’ll need to avoid prefects and Peeves. You’ll eventually find a book that points Sebastian toward more dangerous avenues of research. Ominis shows up and voices concern about Sebastian’s direction, setting up the central tension of the questline: loyalty to a friend versus recognizing when they’re going too far.

In the Shadow of Time

This quest takes you to Feldcroft, the small hamlet where Sebastian and Anne grew up. You’ll meet Anne and their uncle Solomon, a former Auror who’s deeply opposed to Sebastian’s methods. Anne is visibly suffering, and Sebastian’s desperation becomes painfully clear.

Solomon and Sebastian argue about the proper way to handle Anne’s curse. Solomon insists on accepting it and keeping her comfortable: Sebastian refuses to give up on a cure. The tension between them is the emotional core of this mission. You don’t make major choices here, but you’re being positioned to pick a side later. The quest also involves investigating the surrounding area and dealing with Dark Arts remnants tied to Anne’s curse.

In the Shadow of Distance

Sebastian believes a powerful Dark Arts relic might hold the key to curing Anne and drags you (and a reluctant Ominis) to Slytherin’s Scriptorium, a hidden chamber that requires solving puzzles tied to the moral dilemmas players face throughout the game. This is where things escalate.

To proceed, someone must cast Crucio, one of the Unforgivable Curses. Sebastian offers to cast it on you, or you can learn it yourself and cast it on him. This is your first opportunity to learn an Unforgivable Curse, and refusing here doesn’t lock you out permanently, Sebastian will offer to teach you later if you decline.

The Scriptorium itself is full of environmental storytelling about Salazar Slytherin’s darker inclinations. You’ll find the relic Sebastian was looking for, but Ominis makes it clear he’s deeply uncomfortable with where this is headed. The mission ends with Sebastian more determined than ever, even though the moral cost.

In the Shadow of Hope

Sebastian and Anne have a brief, fragile moment of hope in this quest. Sebastian believes the relic he found might actually work, and you accompany him back to Feldcroft to try it. Things don’t go as planned, the relic’s effects are unpredictable, and Anne’s condition worsens temporarily.

Solomon arrives mid-attempt, furious that Sebastian is experimenting with Dark Magic on his own sister. The confrontation is brutal, and Solomon destroys the relic, eliminating what Sebastian saw as his best chance to save Anne. It’s a pivotal moment: Sebastian’s desperation turns into anger, and he begins to view Solomon as the obstacle rather than the curse itself.

This quest doesn’t offer major choices, but it’s the point of no return for Sebastian’s character. Everything after this is consequence.

In the Shadow of the Relic

Sebastian learns of another, even more dangerous relic and insists on retrieving it even though Ominis’s protests. This mission takes you to a goblin-infested area where you’ll fight through waves of enemies to secure the artifact. The combat is heavier here, expect Inferius packs and Dark Wizards.

Sebastian is single-minded at this point, ignoring warning signs and brushing off your concerns. Ominis refuses to participate, leaving just you and Sebastian. The mission is mechanically straightforward (clear enemies, grab the relic), but narratively it’s Sebastian’s final descent. He’s crossed so many lines that one more doesn’t seem to matter.

You return to Feldcroft with the relic, and Sebastian is ready to use it on Anne no matter what it takes.

In the Shadow of Fate

This is Sebastian’s final quest, and it’s where everything falls apart. You arrive in Feldcroft to find Solomon and Sebastian arguing again. Sebastian, convinced the relic will work, tries to use it on Anne. Solomon intervenes, and in a moment of rage and desperation, Sebastian casts Avada Kedavra, killing his uncle instantly.

The aftermath is devastating. Anne, horrified by what her brother has done, destroys the relic and cuts ties with Sebastian. Ominis shows up and is faced with an impossible choice: turn in his best friend for murder, or stay silent. He leaves the decision to you.

You’ll be prompted to either turn Sebastian in to the authorities or protect him. This is the most significant choice in his questline, and it determines Sebastian’s fate. If you turn him in, he’s arrested and removed from the game (though he doesn’t appear much anyway after this). If you protect him, he remains at Hogwarts, wracked with guilt but free. Many players debate whether turning Sebastian in is the right call, and the community remains split on the morally correct choice.

Regardless of your decision, Anne is gone, Solomon is dead, and Sebastian’s arc is complete. It’s a bleak ending with no clean resolution, which is part of why it resonates.

Sebastian’s Relationship Quest Choices: What They Mean

Should You Learn the Unforgivable Curses from Sebastian?

From a gameplay perspective, absolutely. Crucio, Imperio, and Avada Kedavra are powerful spells that make combat significantly easier, especially on higher difficulties. Crucio applies a damage-over-time effect that melts enemy health bars. Imperio turns enemies into temporary allies, which is excellent for crowd control. Avada Kedavra is an instant kill on most enemies, though it has a cooldown.

From a narrative perspective, learning the curses doesn’t change your character’s alignment or how NPCs treat you. There’s no morality system in Hogwarts Legacy, so using Dark Magic has zero consequences outside of Sebastian’s specific storyline. You won’t be judged, expelled, or locked out of content for using them.

If you refuse to learn a curse during Sebastian’s quests, he’ll offer to teach you later in the Undercroft. You won’t miss out permanently unless you complete his questline without ever saying yes. If you turn Sebastian in at the end, you lose the opportunity to learn any curses you skipped, so make sure you’ve picked them all up before making that final choice.

Should You Turn Sebastian In or Not?

This is the big one, and there’s no objectively correct answer. Here’s what each choice means:

Turn Sebastian In:

• Sebastian is arrested and removed from Hogwarts.
• He won’t appear in the castle or during post-game exploration.
• Ominis thanks you for doing the right thing, but he’s clearly devastated.
• You maintain a sense of moral consistency, Sebastian murdered someone, and he’s facing consequences.
• Some players feel this honors Solomon’s memory and respects Anne’s grief.

Don’t Turn Sebastian In:

• Sebastian remains at Hogwarts, guilt-ridden but free.
• You can still interact with him in the Slytherin common room and Undercroft.
• Ominis is conflicted but accepts your decision.
• Sebastian expresses remorse and gratitude, though he never fully recovers from what he’s done.
• This choice feels more loyal to Sebastian as a friend, even if it’s morally questionable.

Neither choice affects the main story ending, your house points, or your relationships with other characters. It’s purely about how you want Sebastian’s story to conclude and whether you prioritize justice or loyalty. Discussions on player forums and Reddit show the community is genuinely divided, which suggests the writers did their job.

How Your Choices Affect the Ending

Sebastian’s questline is entirely separate from the main story ending. Your choices, learning curses, turning him in, supporting or challenging him, do not impact the final battle with Ranrok, the fate of Professor Fig, or the conclusion of the Ancient Magic plotline.

The only “ending” affected is Sebastian’s personal arc. If you turn him in, his story ends with arrest and exile. If you protect him, his story ends with guilt and an uncertain future. Either way, Anne is gone, Solomon is dead, and there’s no happy resolution.

Some players expect a big payoff or a final confrontation where Sebastian either redeems himself or falls further, but that’s not how Hogwarts Legacy handles it. The game opts for a quieter, more grounded conclusion: actions have consequences, some mistakes can’t be fixed, and not every story gets a satisfying wrap-up. It’s surprisingly mature for a game that otherwise leans into power fantasy.

Learning Dark Magic from Sebastian: Imperio, Crucio, and Avada Kedavra

How to Learn Imperio

Imperio is the second Unforgivable Curse you’ll have the chance to learn, and it comes during the quest In the Shadow of Time. After dealing with events in Feldcroft, Sebastian will offer to teach you the spell in a follow-up conversation.

Unlike Crucio, which is tied to a mandatory story moment, Imperio is offered more casually. If you decline during the initial conversation, Sebastian will let you learn it later by talking to him in the Undercroft. The spell itself is fantastic for crowd control, it turns an enemy into a temporary ally who’ll attack their own side. It’s particularly useful against tanky enemies or when you’re outnumbered.

There’s no moral judgment for learning it, and gameplay discussions on PC performance forums note that Imperio is one of the most versatile tools for higher-difficulty runs.

How to Learn Crucio

Crucio is learned during In the Shadow of Distance, when you’re exploring Slytherin’s Scriptorium with Sebastian and Ominis. To progress past a certain door, someone must cast Crucio. You have two options:

1. Let Sebastian cast it on you (you learn the spell by experiencing it).
2. Learn the spell yourself and cast it on Sebastian.

Both options result in you learning Crucio, so pick whichever feels right narratively. If you refuse entirely, Sebastian will teach you the spell later in the Undercroft, you won’t be locked out.

Crucio applies a curse that deals continuous damage over time and makes enemies more vulnerable to follow-up attacks. It’s one of the best DPS tools in the game, especially against high-HP targets like trolls or armored enemies. The DoT stacks with other status effects, making it a staple in optimized combat builds.

How to Learn Avada Kedavra

You can’t learn Avada Kedavra until after Sebastian uses it in In the Shadow of Fate, his final quest. Once that mission concludes (and assuming you didn’t turn him in), return to the Undercroft and talk to Sebastian. He’ll offer to teach you the spell, though he’s clearly shaken by what he’s done.

Avada Kedavra is an instant-kill spell with a cooldown. It works on nearly every enemy in the game except bosses and certain scripted encounters. The cooldown is long enough that you can’t spam it, but short enough to use it multiple times per fight if you’re patient. It trivializes most combat encounters, especially when combined with talents that reduce cooldowns or boost curse damage.

If you turn Sebastian in, you lose the opportunity to learn Avada Kedavra permanently on that playthrough. Make sure you’ve picked it up before making that final decision if you want a complete spell collection.

The Undercroft: Sebastian’s Secret Location

How to Access the Undercroft

You gain access to the Undercroft during In the Shadow of the Undercroft, Sebastian’s first quest. He reveals the entrance, which is hidden near the Defense Against the Dark Arts classroom in the dungeons. Once unlocked, the Undercroft becomes a permanent fast-travel point and a safe space you can return to anytime.

The entrance is a large, ornate cabinet that opens when you interact with it. It’s not marked on the map with a quest icon after the initial visit, but it shows up as a Floo Flame location, making it easy to return. Sebastian and Ominis both frequent the area, so you’ll often find them there if you want to check in or continue conversations.

What You Can Do in the Undercroft

The Undercroft is one of the best practice spaces in Hogwarts Legacy. It’s large, empty, and filled with destructible objects and training dummies. You can test new spells, practice combat rotations, or experiment with talent builds without worrying about enemy aggro or environmental hazards.

It’s also where Sebastian will teach you the Unforgivable Curses if you missed them during his quests. After his storyline concludes, the Undercroft remains accessible, and you can still use it as a quiet retreat. There’s no customization or special loot here, it’s purely functional, but that makes it one of the most useful locations in the castle.

Some players also use the Undercroft for screenshots and roleplay, especially if they’re leaning into a Dark Wizard character build. Testing and optimization guides from gaming laptop reviewers often recommend the Undercroft as a benchmark location due to its consistent lighting and lack of environmental clutter.

Sebastian Sallow Romance: Can You Date Him?

No, you cannot romance Sebastian Sallow in Hogwarts Legacy. Even though the depth of his questline and the amount of time you spend together, the game does not include any romance mechanics for any character, Sebastian included.

There are no dating systems, romance dialogue options, or relationship milestones beyond friendship. Your interactions with Sebastian (and other companions like Poppy, Natsai, and Ominis) are strictly platonic, no matter how much time you invest in their storylines.

This has been a point of frustration for parts of the player base, especially given how much emotional weight Sebastian’s arc carries. The lack of romance options feels like a missed opportunity, particularly for a game that emphasizes player choice in other areas. That said, the absence of romance doesn’t diminish the quality of Sebastian’s storyline, his character development and moral dilemmas stand on their own without needing a romantic subplot.

If you’re hoping for romance content, you’ll need to look to mods (on PC) or wait to see if future DLC or sequels introduce relationship systems. As of the current version, Hogwarts Legacy keeps all companion relationships firmly in the “close friends” category, regardless of how players might interpret the subtext.

Best Dialogue Choices to Befriend Sebastian

Hogwarts Legacy doesn’t have a traditional friendship or approval system, so there’s no hidden meter tracking whether Sebastian likes you or not. But, certain dialogue choices throughout his questline feel more supportive or aligned with his goals, and picking them makes the narrative flow more naturally if you’re roleplaying a character who’s loyal to Sebastian.

Here are the general patterns for dialogue that supports Sebastian:

• Agree to help him whenever he asks, even if the request sounds sketchy. Declining doesn’t lock you out of content, but saying yes keeps the momentum going.
• Defend his methods when other characters (especially Ominis and Solomon) criticize him. This doesn’t change outcomes, but it reinforces your character’s loyalty.
• Express interest in Dark Magic and forbidden knowledge when given the option. Sebastian respects curiosity and ambition, so dialogue that mirrors his worldview strengthens the thematic connection.
• Don’t lecture him about morality or caution. Choosing dialogue that challenges him too harshly can feel out of place if you’re trying to build a supportive dynamic.

Again, these choices don’t mechanically affect anything, you’ll complete his questline and unlock the same content regardless. But if you’re invested in the story and want your character to feel like Sebastian’s true ally (or enabler, depending on how you view it), these patterns help.

Some players prefer to push back on Sebastian’s decisions to create dramatic tension or to reflect their own moral stance. That’s equally valid, and the game accommodates both approaches. The writing is flexible enough that you can be Sebastian’s closest friend, his reluctant accomplice, or his harshest critic, and the core story beats remain intact. Understanding the narrative consequences of key decisions like turning him in helps players make choices that align with their preferred story outcomes.

Conclusion

Sebastian Sallow’s questline is one of the most narratively ambitious pieces of content in Hogwarts Legacy. It’s dark, morally complex, and doesn’t offer easy answers or neat resolutions. Whether you walk away having learned all three Unforgivable Curses, turned him in for murder, or defended him to the end, his arc leaves an impression that most other companion quests don’t match.

The gameplay rewards, Crucio, Imperio, and Avada Kedavra, are undeniably strong, making his questline worth completing from a pure power standpoint. But the real value is in the story itself: a tragedy about desperation, loyalty, and the cost of refusing to let go. It’s the kind of questline that sticks with you long after you’ve finished the game, and it’s a reminder that Hogwarts Legacy is at its best when it leans into the darker corners of the wizarding world.

If you haven’t started Sebastian’s quests yet, they’re worth prioritizing. And if you’ve already finished them, revisiting your earlier choices on a second playthrough can give you a completely different perspective on his character. Few games give you a companion whose story ends in genuine tragedy, and Sebastian’s arc is one of the rare examples done right.