Mabel devised the spell as part of the latest of the Stillman's numerous magical cons and hustles after they unsuccessfully tried to steal the Book of Shadows while disguised as the Charmed Ones. The Stillman Sisters cast the spell at the right moment when all three Charmed Ones were located in the manor as the spell required. The spell turned the Charmed Ones into nonentities while making the world see the Stillmans as Piper, Phoebe and Paige, although they still looked like themselves. The spell also changed every picture of the Charmed Ones into theirs, while adjusting the memories of even Leo and Chris so that the Halliwells had always looked like the Stillmans. Additionally, each Stillman was assigned their new identity based on seniority which also factored when they used the Book of