The shader itself shades horribly with weapons and armor, even looking purple and green with some armor. Twilight keepsake is a much better all-black shader than Superblack.
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I don’t see myself ever using it on weapons honestly. I like my weapons to have the color of the element they are, and for kinetics I have a few neutral favorite shaders. I’ve been using Superblack for armor because it’s new but ultimately I like to match my armor with the element color as well. Though with Superblack it has been fun to find armor with effects of the color of the sub element that don’t shade. My Strand Hunter used the Crota armor because the hive tendril things stay green but then the rest of the armor is black.