On their firt anniverary of becoming witches, the sister face a cloven-hoofed demon called Abraxas, ...
On their firt anniverary of becoming witches, the sister face a cloven-hoofed demon called Abraxas, that steals the Book of Shadows and undoes the spells they've cast, releasing old vanquished enemies of the Charmed Ones. If the demon undoes the spell that granted them their power, they will come back to living normal lives.
imdb:tt0539478