I think all other users agree with me, the percentage of drope of the keys skeleton is outrageously low, I've done about 40 runs, heroic or normal, including 5 Nightfalls, and have only scored 5 skeleton keys (not accumulated) I understand the idea that rare, but not exaggerate!
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While I agree they are rare, they drop 400 light lvl gear for slots you choose. On top of that they also give you a chance for some of the best guns in the game. I run strikes a lot and I think I get one every 6-7 heroic strikes. So what are you proposing the drop rate become? I think that we should just get a guaranteed key drop from our first nightfall each week or something like that.