Skeleton Keys drop so little and inconsistent. Solution? Give Skeleton Keys the Siva Cache Key treatment! Make bosses drop Key fragments - IN ADDITION TO ACTUAL KEYS - so we can make some keys. 1 to 2 per strike would be fair giving you a chance to open chests every 6 to 8 strikes. Rerolling gear would also be good to help us achieve a guardian we like in both looks and perks.
[i]I would add them as Crucible rewards to foment PvE doing PvP and vice-versa, but that's might not be a popular idea.[/i]
[i][u]Edit:[/u] people also want them to be able to be purchased. 150 marks seem reasonable to me. Some motes or marks + a legendary engram (primary weapon or class item is my suggestion) could work, similar to Variks's class items. Please comment if you would like them to be purchasable as well, and what currency would be fair.[/i]
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Or just go into SIVA Crisis where the RNG is better for them.