There, his demonic spirit was captured in the form of a great Black Cauldron.
8 seconds sound clip from the The Black Cauldron movie soundboard.
You can hear this line at 00:00:41 in the Blu-ray version of the movie.
Quote context
[...]
- Since no prison could hold him, he was thrown alive into a crucible of molten iron.
- There, his demonic spirit was captured in the form of a great Black Cauldron.
- For uncounted centuries, the Black Cauldron lay hidden, waiting while evil men searched for it.
- There's something wrong. I can feel it in my bones.
- The Fairfolk know it too. You don't see any of them around.
- The Horned King. That black-hearted devil!
[...]