Hey so I'm not sure if this was meant to be the way it is but when I found multiple level 20 areas I noticed all the level 20 mobs showed immune effects when I shot them with many different weapons. I am level 8 and have progress in gear finding quite a bit so I don't see any other reason to why I can't kill them. I remember reading somewhere that you can take down these creatures but you may need a lot of players, the amount of people wouldn't change the fact they are immune to weapons would it? Or could this just be a glitch people have yet to realize?
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They weren't really immune, you just did so little damage that they basically were immune. People have posted here on the forums of how they killed these enemies, but it took hours to do with multiple people.