Crusader Kings 2's latest expansion is imminent and will add a host of new options pertaining to the belief in a higher power. Cults, religous groups, Societies and secret societies - you'll be able to have characters join these orders, opening new actions and sending them down new event paths.
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The expansion will flesh out the religious aspects of the game, letting you raise faiths up or rip them apart completely.
Monks & Mystics' main attraction will be the addition of Societies, both secret and public. Dibb, dibb, dobb, dobb and all that. Characters can join monastic orders, secret cults and Gnostic heresies. As the members go up, so does the power of the religion's leaders.