What can i do with the Project loot

So i've got a few cache fragments along with the project kat icon shard and project yas shard ( as in the one you need 7 cores for) and i can't do anything with them seen as i can't buy anymore of the project chests and i know they said that you'd be able to disenchant them for a bit of essence but i'm not seeing that option so what's going to happen/ what do i do?
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