The ritual is a necessary performance utilized every hundred years to calm the four elements of Earth, Air, Fire and Water. To this end, four guardian elementals—an Earthshaker, a Windwalker, a Firestarter, and a Waterbearer—must come together, with a Spirit Guardian, a strong human spirit, at the center of a pentagram known as the Circle of Gaea to unite the other four. On the Night of Aeolus, the ritual must be successfully performed, otherwise the elements will continue to move out of control until the world splits apart.