Union
Union is a system to patch and extend Gothic's engine the ZenGin. It allows you to load .dll files - ZenGin extensions created using the Gothic/Union SDK and .patch files - files designed to patch the game's executable. The Union installer also contains the SystemPack a collection of bug fixes and engine edits that improve performance.
-  Plugins 
 Union plugins are shipped in the form of a .dlllibrary. This library contains the compiled C++ code that interfaces with game engine.
-  Union SDK 
 Create plugins with Union SDK, a community-made software development kit for ZenGin. 
-  PATCH file format 
 The .patchfile contains one or more small programs that are designed to change the engine code (game executable). This is usually done to fix bugs.
-  Install Union 
 Install the latest Union and enjoy the bug-free gameplay.