If a group of Church of Satan members now wish to form a â magic circleâ for something more than simple friendship and ritual , and can keep it active for a year and a day , the leader of the group can apply to have it called a Grotto and the leader called a Grotto Master . However , should a group of Church of Satan members form a `` magic circle '' for purposes beyond basic social and ritual interaction , and should that circle remain healthy and active for a year and a day , the leader may apply to have it formalized as a Grotto and be chartered as Grotto Master .