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What Happens If You Use an Unforgivable Curse in Hogwarts Legacy?

The Unforgivable Curses are optional in Hogwarts Legacy. Here’s what each does, how companions may react, and what the game’s guides say about achievements, quests, and endings.
WorldHogwarts Legacy? Length2 min Posted Quest giverVGSources Team
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You can learn and cast Crucio, Imperio, and Avada Kedavra in Hogwarts Legacy. Using them does not trigger a morality meter or a documented gameplay punishment, but companions nearby may react, and the game blocks casting on Hogwarts grounds. The curses are optional for achievements and for completing Sebastian Sallow’s questline.

What each Unforgivable Curse does

Curse Gameplay effect Where you can learn it
Crucio, the Cruciatus Curse Inflicts intense pain on its target. During Sebastian’s quest “In the Shadow of the Study.”
Imperio, the Imperius Curse Puts the target under your control. During Sebastian’s quest “In the Shadow of Time.”
Avada Kedavra, the Killing Curse Kills its target; GameSpot says it instantly kills non-boss enemies in gameplay. During Sebastian’s quest “In the Shadow of the Relic.”

The official Wizarding World FAQ confirms that all three curses are available to learn and play, describing them as having “devastating effects.” GameSpot’s Unforgivable Curses guide details their gameplay effects and quest opportunities.

What consequences follow from using them?

GameSpot reports that casting a curse does not activate a morality system or gamified punishment. That does not mean every character ignores it: a companion with you may look shocked or criticize you. You also cannot cast the curses on Hogwarts grounds.

GameSpot says using the spells does not block achievements or trophies, and that the curses are not required for the all-spells achievement or to finish Sebastian’s questline. This evidence addresses those gameplay systems; it does not establish that curse use has no effect on every narrative variable or ending.

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Hogwarts Legacy - Nintendo Switch
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Can you refuse to learn a curse?

Crucio

In “In the Shadow of the Study,” you can decline to learn Crucio. If you accept, the scene lets you choose whether Sebastian casts it on you or you cast it on him. Windows Central’s Crucio walkthrough reports that declining at this point leaves another chance to learn the spell from Sebastian later in the Undercroft.

Imperio and Avada Kedavra

You can decline to learn Imperio when it is offered in “In the Shadow of Time” and Avada Kedavra when it is offered in “In the Shadow of the Relic.” GameSpot places both opportunities in Sebastian’s questline; the spells are optional rather than prerequisites for completing it.

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Does learning or using a curse change the ending?

The cited guides establish that curses are optional, describe companion reactions, and report no morality meter or gamified punishment. They do not establish that learning or casting a curse alone changes—or guarantees an unchanged—ending. Treat the choice as a combat and role-play decision, not as a proven way to select a particular ending.

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  • EXPLORE AN OPEN WORLD. The wizarding world awaits you. Freely roam Hogwarts, Hogsmeade, the Forbidden Forest, and the surrounding Overland area.
  • BE THE WITCH OR WIZARD YOU WANT TO BE. Learn spells, brew potions, grow plants, and tend to magical beasts along your journey. Get sorted into your house, forge relationships, and master skills to become the witch or wizard you want to be.
  • EXPERIENCE A NEW WIZARDING WORLD ADVENTURE. Experience the wizarding world in an unexplored era to uncover a hidden truth from its past. Battle against trolls, Dark Wizards, goblins, and more as you face a dangerous villain threatening the fate of the wizarding world.
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How to decide whether to use them

  • Choose Crucio for a pain-focused attack, Imperio to control an enemy, or Avada Kedavra for its lethal effect on non-boss enemies as described by GameSpot.
  • If you prefer a character who avoids Dark Arts, you can refuse the learning prompts; declining Crucio at its first opportunity is not your only chance to learn it.
  • If you are concerned about achievements or Sebastian’s questline, GameSpot reports that the curses are not required and that using them does not prevent achievement or trophy unlocks.
  • If you want to avoid companion disapproval, be aware that companions may react when they witness a curse.

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