The spell and slayers2

Willow overcoming her dark side to activate Slayers all around the world, making herself glow and briefly turning her hair white, showing the "good magic" she could channel

White magic has traditionally referred to the use of supernatural powers or magic for good and selfless purposes. With respect to the philosophy of left-hand path and right-hand path, white magic is the benevolent counterpart of malicious black magic. Because of its ties to traditional pagan nature worship, white magic is often also referred to as "natural magic".