We've had these ghost mods for quite a while now and they've been working on random drop exotics... Until the patch 2 weeks ago. Am I the only one because this is a load of bullshit. The mods don't state they only work for legendaries, and since buildcrafting is a thing it should be working for exotics.
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A lot of Exotics have an intrinsic stat that they favor which will override your Ghost mod if it's in the same family of stats For instance, Mask of Bakris favors Mobility. So, if you have a Recovery mod in your Ghost, it won't take effect since Recovery and Mobility are in the same stat grouping and there can only be one focused stat per group