 The soucouyant can enter the home of her victim through any sized hole like cracks, crevices and keyholes.Soucouyants suck people's blood from their arms, legs and soft parts while they sleep leaving blue-black marks on the body in the morning.If the soucouyant draws too much blood, it is believed that the victim will either die and become a soucouyant or perish entirely, leaving her killer to assume her skin.