From publisher blurb:
In the 19th century, the American West was marked by booming technology, polarized political beliefs, territorial skirmishes, racial conflict, Civil War, and continuous expansion. This era also brought to the West an influx of other peoples — along with their religious, spiritual, and magical traditions — adding to the cultures of the indigenous Native Americans ones from Europe, China, Mexico, Central America, and Africa. These disparate influences combined with geographical isolationism and the country’s powerful, nearly raw power to alter many rituals and practices and make them uniquely American.
This supplement to the Gold-bestselling Cthulhu Live 3rd Edition live-action role-playing game of Mythos horror introduces eight magic traditions, a new spell for each, and new mechanics for spells — rituals, components, fast casts, and visible effects — to give players a three-dimensional feel for the magic of the Old West. All of these are rules-light and easily adapted to tabletop games like Call of Cthulhu.