Mystery Cult Rules

MCIs may not grant merits to templates that would not ordinarily be eligible to receive them. For example, Vampires can't take Mage merits, and Werewolves can't take Changeling merits, full-template supernaturals can't take Mortal+-only supernatural merits. This also applies to Gift Facets, Disciplines, Contracts, etc.
MCIs merits may ignore other prerequisites such as Skills and Attributes. If the MCI grants points in a Style or a scaling Merit, you may not purchase beyond what the MCI grants unless you meet the ordinary prerequisites of the merit.
MCIs must have a minimum of three player character members at founding, played by three unique players.

Mystery Cult List