These 2 shaders are one of the few things I don't have in this game...I'm a beta player and still don't have these two shaders.Ive been grinding ROC and haven't seen these two at all.Some people say that it comes from a cryptarch package but I've open a good amount of those while playing this game and have not gotten even one.Just posting to see who has one of them and to ask how'd you got them
Edit:looks like everyone has been getting them from Rahool and roc,thanks for the info guys
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Arctic Proxy comes from Rahool, I have no clue what Substance 321 is.