When you see the tag associated with CODEX releases, it refers to a package that contains the base game, the v3.3.0 patch, and every piece of DLC released up to that point, including:
: Coinciding with this era, the Crusader Kings II base game became free to play on platforms like Steam. crusader kings ii holy fury update v3 3 0 incl dlccodex upd
: Special events for Greek or Italian rulers to "Delve into Classics" and secretly restore the ancient Hellenic religion . Technical Information Holy Fury - Crusader Kings II Wiki Crusader Kings II: Holy Fury – The Definitive
💡 If you are using the CODEX release, ensure the update path matches your base game version to avoid save file corruption. To help you get started with 3.3.0 , tell me: Which region or religion you want to play first? If you need a guide on reforming a faith ? Technical Information Holy Fury - Crusader Kings II