Crusader Kings III: By God Alone, released by Paradox Interactive on September 30, 2026, lists 12 headline features on its store page. The first is the one most players will pay for. Theocracies have been in the game since 2020, but only the computer could run them. Now you can rule a realm headed by an archbishop, or the Papacy itself.
The expansion costs $19.99, £16.99 or €19.99 on Steam for Windows, Mac and Linux. It also comes in the $43.99 Chapter V bundle with Silk & Silver, a second expansion Steam lists for late 2026. Paradox’s announcement does not mention consoles.
Paradox Development Studio’s Crusader Kings III is a grand strategy game about a family, not a country. You play one ruler at a time, arranging marriages and plotting against rivals, and when that ruler dies you carry on as the heir. Religion was always part of it. Piety is a currency you spend on religious actions, and tenets are the core beliefs that define each faith. By God Alone turns the church itself into something you can run, or try to steer from outside.
How the church works from the inside
The centerpiece is what Paradox calls the Christian Situation, a lasting set of actions and decisions for Christian realms. Through it you can take part in Ecumenical Councils, the meetings that settle what the faith believes. Rites that stray too far from the standard faith can be declared heretical, and a ruler who follows one must conform or rebel. In the 867 start, the church eventually reaches a fork that can end in the Great Schism, splitting Western Catholicism from Eastern Orthodoxy.
Playing the Pope brings new sources of money and power, plus a College of Cardinals. The Pope appoints cardinals across Christendom, and secular rulers use their own power to sway who gets in. Archdioceses are new church titles with authority over a whole region, no matter who owns the land. Puppets run both ways. A king can make a cleric act for him inside the church, and a cleric can do the same to a king.
The Spiritual Fulfillment system tracks each character’s inner life. A sin now affects a ruler’s standing with God and the afterlife, on top of stress, the meter that rises when a ruler acts against type. Monastic Holy Orders double as centers of research, and hosting an order’s headquarters brings bonuses. The monks’ prayers also protect a lord from damnation.
Chapter V and an uneven first day
Paradox sells Crusader Kings III’s add-ons in yearly bundles it calls Chapters. Chapter IV closed in October 2025 with All Under Heaven, which stretched the map across Asia. The base game, out since September 1, 2020, had passed 4 million copies by April 2025, PC Gamer reported. Silk & Silver will make republics and merchant families playable next, so the list of computer-only governments is getting short.
On the morning of October 1, Steam rated the expansion Mixed, with 68% of 174 user reviews positive. English reviews ran 83 positive out of 113. The complaints are mostly launch bugs, such as the AI insisting you own counties you do not, and a steady stream of requests for anyone who heads a faith. Several headline systems, including the Christian Situation and the College of Cardinals, apply only to Christian realms, which matters if your dynasty follows another faith.
If your games already revolve around Rome, this is the add-on that was missing. Buy it at $19.99 now, or take the $43.99 bundle if you want Silk & Silver too. Anyone put off by the bug reports loses nothing by waiting a few weeks.
