Thousands had been enslaved by the obscene cult of vampirism.

4 seconds sound clip from the Dracula: Prince of Darkness movie soundboard.

You can hear this line at 00:02:13.383 in the Blu-ray version of the movie.

Quote context

[...]

- After a reign of hideous terror spanning more than a century, the king of the undead was finally traced to his lair, high in the Carpathian Mountains.

- Through the decades, many had sought to destroy him. All had failed.

- Here, at last, was an adversary armed with sufficient knowledge of the ways of the vampire to bring about the final and absolute destruction.

- This then was his fate.

- Thousands had been enslaved by the obscene cult of vampirism.

- Now, the fountainhead himself perished.

- Only the memory remained. The memory of the most evil, and terrible creature who ever set his seal on civilization.

- Calm yourself. Stay with me.

- You know this is for the best! The risk is too great to allow for any other way. You do understand. You must understand.

- Frau Koenig, tell me that you agree.

[...]