I think a few more aesthetic options would be nice. I know I'm not alone in wanting a helmet toggle option. And I for one would like to transmog my armor. So if I find a piece that looks really cool, but it's worse than what I have currently equipped, I can use the look of the cool one, while getting the armor of the better one.
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Along with ur armor idea. I think it would be nice if we could add pieces to the armor. Like little pipes, containers, pads and stuff like that. So that not all the armor looks the same.