will set them free

Details:                                    The spell to invoke the Power of Three and was first used to vanquish the warlock Jeremy.  This the most powerful spell that the Charmed Ones possess as it summons their collective power to either protect them or destroy their opponents, or both. 

No force can stand against this spell.  

This spell was written in the BOS but a shorter version was engraved on the back of the family's spirit board by their mother, Patty.