The Spell to Deflect Demons was a spell written in the Book of Shadows once the Power of Four was reconstituted. This spell must be cast by the Power of Four as it is such a powerful spell; its effects are that there is a force field cast around a certain area that deflects demons. Prue, Piper, Phoebe and Paige cast this spell as a way to protect themselves from the Seer. 
- We cast this spell with the Power of Four,
- Casting this spell from our heart's core,
- Deflect this demon from our home,
- Create us, a protective dome.