At least some content in this article is derived from information featured in Harry Potter: Wizards Unite. As such, spoilers will be present within the article.
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The Weakening Hex (incantation unknown) is a hex that impairs foes and reduces the damage they can cause via their spell casting. A common tool for Aurors, it was taught by Harry Potter to members of the Statute of Secrecy Task Force in the 21st century to help deal with the results of the Calamity.