Hermione put the vanquished Horcrux into the beaded bag, then climbed back into her bed and settled down without another word.
But Harry’s imagination was racing ahead, far beyond Ron and Hermione’s… Three objects, or Hallows, which, if united, will make the possessor master of Death…Master…Conqueror…Vanquisher…The last enemy that shall be destroyed is death… And he saw himself, possessor of the Hallows, facing Voldemort, whose Horcruxes were no match…Neither can live while the other survives…Was this the answer?
There are no more uses of "vanquish" in the book.
Show samples from other sources
The team vanquished all competition.
You need to vanquish those negative thoughts and think about good things.