The Erchitu is a creature from Sardinian mythology. It appears as a large white ox, often accompanied by a devil. This devil will ride the Erchitu, lighting candles on its horns and prodding it with hot a poker.
The Erchitu is seen as a sort of lycanthrope. Any man who has committed a serious misdeed might turn into an Erchitu upon the full moon. They will find a house and bellow three times before the threshold; someone within the house will then die inside of a year.
If a strong and virtuous person is able to blow out both of the Erchitu’s candles in one breath, it will be freed from its curse.