A blood pact is a type of magically binding agreement between two parties who share their blood. It could be made by the parties cutting their hands with their wands and interlacing them and making the desired oath. Upon doing this, two glowing drops of blood would raise from their palms and mingle into one. Thereafter, a vial would take shape around it, enclosing the drop, signifying that the deal was struck. Once made, the vial was supposedly impossible to destroy.

This pendant contained the sealed blood of Albus Dumbledore and Gellert Grindelwald after they made their blood pact in the summer of 1899.

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