Wicca

Wicca is the religion practiced by Willow, Tara, Amy, and along with the rest of the witches in the show. Tara states that a long time ago Wiccan's took an oath promising that they would never interfear with the basic laws of nature (meaning they wouldnt bring anyone back from the dead, or anything tha thas to do with changing a part of nature that has all ready been set). Not all Wiccan's have the ability to maniplate the mystical forces like Willow, Amy, and Tara, some just practice the religion, hold rituals, and chant by theirself or with the aid of a coven. Willow Rosenberg is one of the most powerful Wiccan's alive, she capable of many maigcal features, including ressurecting Buffy.