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Hogwarts Legacy · Player Guide

Sebastian Sallow Questline: Unlock Crucio, Imperio & Avada Kedavra

Missed an Unforgivable Curse? Use the three-quest decision flow, exact Avada Kedavra dialogue and Undercroft backup route before turning Sebastian in.

Updated October 20, 2026Step-by-stepInteractive reference
Home / Hogwarts Legacy / Sebastian Sallow Questline: Unlock Crucio, Imperio & Avada Kedavra

Quick Answer

Missed a lesson? You can still ask Sebastian in the Undercroft for any unlearned curse if you keep him available. In In the Shadow of Fate, choosing to turn Sebastian in closes that backup route. To learn Avada Kedavra immediately, choose “Everyone should know that curse.” followed by “Yes, please.”

Interactive Guide

Sebastian Decision Flowchart

Select the spell you missed and whether Sebastian remained available.

The three curse decisions

01
Crucio — In the Shadow of the Study: either allow Sebastian to cast it on you or cast it on him; you can learn the spell either way if you accept the lesson.
02
Imperio — In the Shadow of Time: ask Sebastian to teach you the Imperius Curse in the catacomb conversation.
03
Avada Kedavra — In the Shadow of the Relic: immediately following the catacomb encounter, select “Everyone should know that curse” and then “Yes, please.”

Missed Avada Kedavra: recovery path

01
Continue Sebastian and Ominis’s relationship questline until In the Shadow of Fate.
02
Tell Ominis that you do not want Sebastian turned in. This matters for access to future lessons.
03
Find Sebastian in the Undercroft after the relevant quests and ask to learn any previously declined curse.
Permanent lockout warning: If you turn Sebastian in and have not learned a curse, that character loses the Undercroft teaching option. Reload an earlier save if one exists; otherwise the lesson may be missed for that playthrough.

Dialogue and achievement realities

The quest’s narrative does not use a conventional morality meter. Choosing to learn a forbidden spell is separate from the ending choice made later in the main story.

There are no prerequisites requiring you to cast Crucio on Sebastian instead of allowing him to use it on you. Learn what you need when offered; if unsure, make a manual save before the dialogue.

Common mistakes

  • Assuming the first refusal always means the spell is lost forever.
  • Turning Sebastian in before checking whether all three spells have been learned.
  • Looking for an automatic Avada Kedavra pop-up without choosing the lesson dialogue.
  • Confusing In the Shadow of the Relic with the later In the Shadow of Fate consequence decision.

Frequently Asked Questions

Can I learn Avada Kedavra after refusing Sebastian?

Usually yes, later in the Undercroft if Sebastian is not turned in.

Can I learn Crucio without casting it on Sebastian?

Yes. The scene offers a route where Sebastian casts it on the player.

What happens if I turn Sebastian in?

The opportunity to learn any remaining curses from Sebastian is lost on that save.

References & Verification

Gameplay details may vary slightly by patch and platform. Illustrative controls on this page are explanatory tools, not live game integrations.

https://hogwarts-legacy.fandom.com/wiki/In_the_Shadow_of_Fatehttps://www.gamespot.com/articles/hogwarts-legacy-how-to-use-unforgivable-curses-and-the-consequences-of-using-them/1100-6511476/