tormentor

also tor·ment·er (tôr-mĕnˈtər, tôrˈmĕnˌ-)

1. One that torments.
2. A hanging at each side of a stage directly behind the proscenium that serves to block the wing area and sidelights from the audience.
3. A sound-absorbent screen used on a movie set, used to prevent echo.