Runamula

Runamula, according to legend, is a product of unacceptable mixing of blood: this is a creature born from the relationship of a married woman with a priest or from the relationship of people in a family relationship.  

On Tuesday and Friday nights, this monster, most often female, takes the form of a dark, devilish horse or mule, on which sits a rider dressed in all black, this pair gallops through the village all night, terrifying the village with the clatter of hooves, and a devilish flame bursts out of the animal's mouth.