§ Of Beren and Lúthien The Silmarillion

But no wizardry nor spell, neither fang nor venom, nor devil's art nor beast-strength , could overthrow Huan without forsaking his body utterly. Ere his foul spirit left its dark house, Lúthien came to him, ghost be sent quaking back to Morgoth; and she said: 'There everlastingly thy naked self shall endure the torment of his scorn, pierced by his eyes, unless thou yield to me the mastery of thy tower.'