Definition of A call to arms (charmed episode)

Reeling from the loss of their future son Chris, an overprotective Piper and Barbas-obsessed Leo are forced by Phoebe and Paige to attend a Hindu wedding, where they inadvertently receive the powers of the Hindu's Ultimate Lovers, Shakti, the Goddess of Creation and her lover, Shiva, the God of Destruction. In order to save the universe from destruction, Phoebe and Paige must keep Leo and Piper from consummating their love. Feeling out of sorts, Phoebe decides to take a sabbatical from her advice column and is shocked to learn that her replacement is a guy, Leslie St. Claire, whom she is attracted to due to the spell on Piper and Leo. Paige, upset over Magic School closing, decides to fight to keep it open. Meanwhile, Inspector Sheridan, with a reluctant Darryl as partner, keeps investigating future Chris' disappearance, and has a search warrant.