The Arcanum Prismatica are rituals that have been designed to work with contributions from Arcanists and Clerics of multiple faiths, allowing many different ritualist circles to cooperate on a ritual. Many of them do not merely allow multiple different faiths or magical traditions to cooperate in performing a ritual, but actually gain in power or effect the more variety there is amongst those who perform them.
Whenever you perform a Prismatic ritual, any ritualist may assist in performing the ritual, regardless of whether they are the same kind of ritualist as the leader of the ritual. Ritualists who have Mastered the ritual have their Ritual Power contributions doubled as usual. A ritualist must contribute at least 1 Ritual Power to a Prismatic ritual in order to be considered a participant in it.