MOD(modification的縮寫)是對遊戲的修改以及實現模組製作的目的。MOD的種類很多，從小的調整到完全的轉換，應有盡有。
MOD創建者或玩家可以為他們喜歡的mod或工具創建一個wiki頁面，作為其功能性協作文檔。
安裝
模組可從User Modifications sub-forum (需要註冊)處手動下載並安裝，或在Steam Workshop訂閱並自動下載、安裝。
模組安裝路徑：
- Windows:
~\Documents\Paradox Interactive\Crusader Kings II\mod\ - Linux:
~/.paradoxinteractive/Crusader Kings II/mod/ - Mac:
~/Documents/Paradox Interactive/Crusader Kings II/mod/
請不要將模組安裝在遊戲主文件夾中(例如： C:\Program Files (x86)\Steam\SteamApps\common\Crusader Kings II\mod)，否則模組將無法正確加載。
仔細閱讀模組描述，以確定該模組能在當前版本的王國風雲2上運行。如有需要，請在Steam的「測試」標籤下選擇回滾的patch。[1]
若是手動安裝，步驟通常如下（若有，則參照特定的安裝步驟）：
- 移除現存的模組文件（模組文件夾和mod文件）。該步驟非常重要，因為遊戲將加載mod文件夾中的所有文件，所以會與不再存在的模組文件或在新版本中重命名的舊模組文件有衝突。
- 若有，則刪除~\Documents\Paradox Interactive\Crusader Kings II\<mod_name>\gfx文件夾以清空gfx緩存。
- 解壓下載好了的壓縮文件，使王國風雲2的mod文件夾中含有該模組的mod文件和模組文件夾。
- 啟動王國風雲2並在MOD欄中勾選相應模組。需注意模組名或會與mod文件的名字不一致。
- 開玩！
更多信息請查閱structure of a mod。
MOD兼容性
Some smaller mods may be timeless, but most often a mod is only compatible with a specific vanilla patch, and players need to check the version and potentially rollback to an older patch.
Incompatibilities happens when a mod:
- has to overwrite vanilla files, usually because of modding restrictions or limits to folder-based loading behavior.
- is a total conversion and/or major overhaul, and is deeply tied to vanilla.
In addition mods may be incompatible with each others, if they modify the same vanilla files or entities (graphic sprites, defines, ...). Refer to the mod FAQs for known incompatibilities.
MOD列表
具有Wiki頁面的Mods
Mods按字母順序排序。使用Category:模組按子類別瀏覽mods。
活躍中的mods
- A Game of Thrones
- A.D. 633: Rise of Islam
- After the End
- Ancient Religions
- CK2Plus
- Elder Kings
- Historical Immersion Project
- Les Trois Tours / The three Towers
- Lux Invicta
- Middle Earth Project
- Nova Monumenta Iaponiae Historica
- Princes of Darkness
- Romance of the Three Kingdoms
- Simple Slavery
- The Winter King
- Warhammer: Geheimnisnacht
- When The World Stopped Making Sense
- Witcher Kings
已失效的mods
Some mods are no longer maintained, and not compatible with the more recent vanilla patches:
- Crackdtoothgrin's Graphical Goodies
- Crisis of the Confederation
- Diadochi Kings
- Magnate Lords
- Mythos
- Nomen Magnus
- North Africa Expansion
- Terra Normannorum
- The Prince and the Thane
- The League
歷史時間軸拓展
MOD的一個部分試圖創建額外的歷史劇本，試圖延長P社遊戲所涵蓋的歷史時間軸。
該模組離原始時間範圍和地圖範圍越遠，就越需要適應或重寫更多的機制和事件，以適應時期或地點，需要進行的大修也就越多。
| Start date(s) | Map scope | Mod |
|---|---|---|
| 653 BC | Vanilla | Pharaohs & Consuls - Forum |
| 323 BC | Mediterranean | Diadochi Kings |
| 184 AD -> 220 AD | China | Romance of the Three Kingdoms |
| 410 AD -> 962 AD | Western Europe | The Winter King |
| 445 AD -> 600 AD | Vanilla | Early Bookmarks Submod for When The World Stopped Making Sense - Forum |
| 476 AD -> 600 AD | Vanilla | When The World Stopped Making Sense |
| 633 AD | Vanilla | A.D. 633: Rise of Islam |
| 769 AD | Vanilla | Vanilla Charlemagne expansion |
| 821 AD | Vanilla | Imperator Ludovicus - Bookmark for 821 AD - Forum |
| 867 AD | Vanilla | Vanilla The Old Gods expansion |
| 935 AD | Vanilla | Iranian Intermezzo: Bookmark for year 935 - Forum |
| 1066 AD -> 1337 AD | Vanilla | Vanilla base game |
| 1337 AD -> 1469 AD | Western Europe | Western Europe 1337-1469 - The Rose, the Lily, and the Oak - Forum |
| 1180 AD, 1493 AD -> 1534 AD | Japan | Nova Monumenta Iaponiae Historica |
| 2015 AD | Vanilla | 2015 mod - Forum |