An alp is a nightmare creature originating in German folklore. Not to be confused with the similarly named Alp-luachra, the alp is sometimes likened to a vampire, but its behavior is more akin to that of the incubus. It is distinct from both of these creatures in that it wears a magic hat called a Tarnkappe, from which it draws its powers. The word "alp" is a variation on the word "elf". It is also known by the following names: trud, mar, mart, mahr, schrat, and walrider. Many variations of the creature exist in surrounding European areas, such as the Druden and Schratteli, or Old Hag in English-speaking countries.