This is a great solution. They could also add additional perks and modifiers (damage etc.) to existing weapons that pertain only to minions of darkness(PvE). For example, bonus impact against minions of darkness. Again, buff to PvE, but not PvP, and the weapons feel the same in terms of its overall performance.
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Agreed. There are already perks that pertain to killing Minions of Darkness. But this is exactly what I"m talking about. Stuff like this can work great in either mode and still leave the base stats of the gun the same.