Hamelin Demons were an interdimensional, parasitic demonic species known for to feed on family trauma from children due to abuse, addiction, homelessness, divorce etc., provoking mental hallucinations to the victims: they believed themselves to be living a perfect life with their parents and they never aged. One of these creatures was present in San Francisco, occuping a building and attracting many children for decades until the Scooby Gang managed to kill it. Additionaly, the demon's blood also resulted in Buffy, Dawn Summers, Alexander Harris, Willow Rosenberg, Spike and Rupert Giles becoming subject to a powerful illusion that forced them to deal with their parents. All, with Giles as the only exception for being a child at the time, could resist to it.
Behind The Scenes
- His name and attributes are a reference to the Grimm's fairytale "The Pied Piper of Hamelin".