A cloaked figure landed their broom and walked into a dark castle-like room. It was high in a tower. It may have been Hogwarts, but there were also other castles in the northern parts of the United Kingdom.
It held the jar in its cloaked hands. Breathing whisperingly as they walked. They passed by a crystal ball mounted on what resembled a birdbath made of stone. The bath did not contain water, it contained purple flames.
The moon was full and the sky was dark. A distant howl could be heard.