These 20 Lethal Ladies Will Give You Chills. Seriously Creepy.

1. Elizabeth Báthory: Largely considered the world's most prolific female serial killer, the Hungarian countess murdered anywhere from 80-600 young girls that she lured to her castle. Witnesses at the time dubbed her the "Blood Countess" after claims of her eating the flesh and/or drinking the blood of her victims came to light.

1. Elizabeth Báthory: Largely considered the world's most prolific female serial killer, the Hungarian countess murdered anywhere from 80-600 young girls that she lured to her castle. Witnesses at the time dubbed her the "Blood Countess" after claims of her eating the flesh and/or drinking the blood of her victims came to light.

1. Elizabeth Báthory: Largely considered the world's most prolific female serial killer, the Hungarian countess murdered anywhere from 80-600 young girls that she lured to her castle. Witnesses at the time dubbed her the "Blood Countess" after claims of her eating the flesh and/or drinking the blood of her victims came to light.