A century ago, Celtic groups descending from the famed Hermetic Order of the Golden Dawn pioneered a fascinating form of ceremonial magic invoking Pagan Celtic powers instead of relying on the more commonly used Judeo-Christian names and symbols. Those groups disappeared many decades ago, and their teachings were lost. But today, their legacy has been reborn. Respected occult author and Grand Archdruid John Michael Greer has re-created a complete...