I have a Husk in the Vault and a Crux of Crota, too. I just never bothered finishing the questline. Is it still possible to complete it? I'd like to, Necrochasm is the only year one exotic I don't have.
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There is no questline just a matter of killing enemies to lvl up the husk then buy i elieve it's the enbalming orb from eris. If not then it's the other item she sells which will change it to the eidolon ally. The last slot on the ally is for the Crux