Eva Levante
the shader's and cosmetics Tower NPC
should sell Chroma
it makes sense
it adds purpose to an underutilized NPC
or better yet, chroma shouldn't even be an Inventory Item
just visit Eva and have her paint your gear directly
less useless currencies clogging up this game
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Eva Levante should do a lot of stuff that she usually doesn't. As the Guardian Outfitter, she should be responsible for almost everything that governs a Guardian's appearance ( with the exception of selling armour, there are other vendors for armour ).