BDMutator_RestoreInvisibilityPowerup.pk3 restores the Invisibility Spheres of the original game, that were replaced by Rescuable Marines in Brutal Doom


To use this:
Select Brutal Doom's main file, then hold Ctrl, and select this mutator. Now click and hold your left mouse button over Brutal Doom, and drag it over your engine executable, so you can load both files, and by doing in this order, Brutal Doom will be loaded first so the patch can work.