If you are using the v3.0 "All DLC" package, these are the primary expansions you should expect to be included and the mechanics they unlock:
: Creating a userdir.txt file in the main game folder can help redirect the game to look for DLCs in a specific library folder. File: Crusader.Kings.II.v3.0.ALL.DLC.zip ...
The query refers to a common file name used for non-official, full-version downloads of (CK2). While there is no single academic "paper" on this specific file, there are several "helpful" resources—including manuals and guides—to assist users with this version of the game. 📜 Unofficial Manual & Strategy Guides If you are using the v3
: Allows characters to join secret societies, cults, and monastic orders. and monastic orders.