"Dumbledore is particularly famous for his defeat of the Dark wizard Grindelwald in 1945, for the discovery of the twelve uses of dragon’s blood, and his work on alchemy with his partner, Nicolas Flamel’! Theo!" she squealed, grabbing onto his arm. Harry watched him go pale. "You’re brilliant. Follow me!" She didn’t really give them much of a choice, dragging a pale, pliant Theo by his arm and having the rest of them race after her.