Then: For seven years, the Halliwell sisters fought all sorts of evil, including the Source of all evil. However, the sisters met their match against a demon named Zankou, a demon so evil, that the Source locked him up because he was afraid of him. The sisters, knowing no other way to defeat Zankou, orbed into their basement as Zankou took in the Shadow from the Nexus. Using a spell, the sisters vanquished the Shadow and Zankou, but the resulting explosion destroyed them as well.
Now: The Elders, sensing that evil was already growing, and at an alarming rate, knew they had to do something to contain the growing evil. The Elders knew they couldn't wait for Wyatt and Chris, the two surviving Halliwell family members, to grow up enough to fight demons. So the Elders have begun a hunt for new witches, which will become a new Power, one that can fight the newly emerging evil.
Now, as the magical community is under attack by evil, witches are being slaughtered, and demons are rampant, the Elders have started their search, and are closing in on their new Power. Will this new Power be able to slow the tide of evil as well as the Charmed Ones before them? Or will the Elders have to rely on the entire magic community to even have a chance?