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The fallen aren't going to be come a playable race. An important design decision they chose to make with Destiny was that Race has no impact on gameplay, and since the Fallen have four arms, it just isn't feasible to implement them under those conditions (ignoring the fact that we do not have enough buttons to handle a quadrawielding system). And creating some sort of Fallen look-alike with only two arms would only dissapoint people. No, it's best to leave them out of the Playable Character Pool.