Drude

In German folklore, a drude (German:Drude, pl. Druden) is a kind of malevolent nocturnal spirit (an elf (Alp) or kobold or a hag) associated with nightmares, prevalent especially in Southern Germany. Druden were said to participate in the Wild Hunt and were considered a particular class of demon in Alfonso de Spina's hierarchy. The word also came to be used as a generic term for "witch" in the 16th century (Hans Sachs).