IMO, Skeleton Keys should use a similar system as SIVA Cache Keys. You get fragments, coins, or whatever after each strike completion. After compiling 10, you get a key. The Nightfall will drop 5 every time it's completed. The other 2 playlists would drop 3 and 2 respectively.
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Yes please!
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This would be better.
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Like that idea
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It's nothing genius but the system is there and really think it could work