The main thing to know about this plugin is that if you're going to refer to it, you must use ALL CAPS.
Along with that, you should know that it adds extra gore to every monster that dies. Some monsters spill blood when you shoot them. Bullets/explosions leave marks on the ground and walls. All changes are purely visual. The amount of gore you see is configurable (see readme for details).
This is compatible with M2 and Infinity, and any other scenario that largely uses unmodified versions of those monsters.