The Siren

As a mortal, the Siren fell in love with a married man. When their affair was discovered, the man suffered no blame, but the townswomen cheered as she burned at the stake. Instead of dying, the Siren became demon through her rage and inflicts the pain she felt on married couples. Luring both the husband and wife with her song, she burns the husband's lungs with the same fire that burned her as the wife watches, and then engulfs the wife in flames.

Appendices

 * (book of shadows text:)

Siren

 * As a mortal the Siren fell in
 * love with a married man but
 * when they were caught the man
 * was held blameless. The village
 * women cheered as they burned
 * her to death and her rage turned
 * her into a Siren, a vengeful demon
 * who seduces married men with her
 * song, then destroys the couples
 * with the very flame that consumed her.