Blood Pact Harry Potter. His defeat of the Dark Wizard Grindelwald in 1945 for the discovery of the twelve uses of dragons blood and his work on alchemy with his partner Nicolas Flamel. The blood pact to put it in simple terms meant that as long as Grindelwald had it in his possession he was free to rise to dominance over the wizarding world whereasDumbledore was actively prevented from trying to stop him anyway so Dumbledore wouldnt be a problem.

We used to believe he couldnt move against Grindelwald because he loved him or because it would mean to face the truth about who killed Ariana Albus sister when they were young. The blood pact to put it in simple terms meant that as long as Grindelwald had it in his possession he was free to rise to dominance over the wizarding world whereasDumbledore was actively prevented from trying to stop him anyway so Dumbledore wouldnt be a problem. Albus Dumbledore and Gellert Grindelwald made a magical blood pact sometime in the summer of 1899 in order to prevent one another physically harming the other.
Jakob returns and Harry learns about the Pact For once in his life Harry Potter had found himself enjoying his birthday and he knew that he would always remember the day he turned thirteen with fondness.
His defeat of the Dark Wizard Grindelwald in 1945 for the discovery of the twelve uses of dragons blood and his work on alchemy with his partner Nicolas Flamel. I cant because of a blood pact harry-potter fantastic-beasts the-crimes-of-grindelwald. A blood pact incantation unknown is a type of magically binding agreement between two parties who share their blood. Its revealed in Fantastic Beasts.