MOD(modification的缩写)是对游戏的修改以及实现模组制作的目的。MOD的种类很多，从小的调整到完全的转换，应有尽有。
MOD创建者或玩家可以为他们喜欢的mod或工具创建一个wiki页面，作为其功能性协作文档。
安装
模组可从User Modifications sub-forum (需要注册)处手动下载并安装，或在Steam Workshop订阅并自动下载、安装。
模组安装路径：
- Windows:
~\Documents\Paradox Interactive\Crusader Kings II\mod\ - Linux:
~/.paradoxinteractive/Crusader Kings II/mod/ - Mac:
~/Documents/Paradox Interactive/Crusader Kings II/mod/
请不要将模组安装在游戏主文件夹中(例如： C:\Program Files (x86)\Steam\SteamApps\common\Crusader Kings II\mod)，否则模组将无法正确加载。
仔细阅读模组描述，以确定该模组能在当前版本的王国风云2上运行。如有需要，请在Steam的“测试”标签下选择回滚的patch。[1]
若是手动安装，步骤通常如下（若有，则参照特定的安装步骤）：
- 移除现存的模组文件（模组文件夹和mod文件）。该步骤非常重要，因为游戏将加载mod文件夹中的所有文件，所以会与不再存在的模组文件或在新版本中重命名的旧模组文件有冲突。
- 若有，则删除~\Documents\Paradox Interactive\Crusader Kings II\<mod_name>\gfx文件夹以清空gfx缓存。
- 解压下载好了的压缩文件，使王国风云2的mod文件夹中含有该模组的mod文件和模组文件夹。
- 启动王国风云2并在MOD栏中勾选相应模组。需注意模组名或会与mod文件的名字不一致。
- 开玩！
更多信息请查阅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页面的Mods
Mods按字母顺序排序。使用Category:模组按子类别浏览mods。
活跃中的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Some mods are no longer maintained, and not compatible with the more recent vanilla patches: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
历史时间轴拓展
MOD的一个部分试图创建额外的历史剧本，试图延长P社游戏所涵盖的历史时间轴。
该模组离原始时间范围和地图范围越远，就越需要适应或重写更多的机制和事件，以适应时期或地点，需要进行的大修也就越多。
| 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 |