West Indian vampire The fire rass can leave its own skin (by going to a Devil Tree - unsure if that is a specific tree or type of tree) and turn into a flame or blue ball of bright light that haunts the night searching for blood to meet the terms of her deal. After it has collected enough blood it can return to its skin and retake human form.
This creature is apparently compulsive and must stop to count grains of sand spread upon the ground. So, a defence against it was to leave a pile of rice or sand near your front door. Hopefully, the creature would take so long to count it all that the sun would eventually return with the coming of morning. By that time the fire rass would have to return to its skin without making an attack.