The term 'Piper Followers' refers to the rats that followed the Pied Piper of Hamelin, a character in a German folktale. The story tells of a mysterious piper who was hired by the townspeople of Hamelin to rid the town of rats. After the piper successfully drove the rats away, the townspeople refused to pay him for his services. In revenge, the piper used his magical powers to lure the town's children away, never to be seen again. Thus, the term 'Piper Followers' is used to refer to the rats that followed the Pied Piper out of Hamelin.