Crusader.kings.ii.holy.fury.update.v3.1.0-codex...

Before the v3.1.0 specific tweaks, the base expansion introduced several game-changing systems available on the Crusader Kings II Wiki:

Catholic rulers must now seek official Coronations from the clergy, while exceptionally pious characters can be canonized as Saints after death. Key Changes in Update v3.1.0 Crusader.Kings.II.Holy.Fury.Update.v3.1.0-CODEX...

If using the "Random World" feature, players can use specialized map generation tools to further customize their seeds. Before the v3