SIVA Key Fragments
From Destinypedia, the Destiny wiki
SIVA Key Fragments drop throughout Wrath of the Machine off of bosses and from loot chests. Ten Fragments can be used to craft a single SIVA Cache Key which are needed to open a SIVA Cache within the Raid. The Fragments can also be used on their own to re-roll any Wrath of the Machine gear the player may have and alter the stats and perks randomly.
Unused SIVA Cache Keys can be turned into Shiro-4 and be traded back for SIVA Key Fragments.
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