In 2000, the Charmed Ones wrongly identified one of the Four Horsemen of the Apocalypse as the Demon of Anarchy. In the hopes of vanquishing the demon, the sisters cast the spell to vanquish this demon. But their spell, combined with one of the evil spells from the Horsemen, created a vortex to another dimension which trapped Prue and War, one of the Horsemen. Piper and Phoebe reversed the vanquishing spell which reopened the vortex and released them both.