I got a new Husk of the Pit today and grinded it up to an Eidolon Ally and it says it still needs a crux of crota to upgrade? It also didn't start the exotic quest line for me.
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You have a Y1 Husk. You're better off scrapping it and grinding for a Y3 valued Husk. I recommend running Heroics or story missions with a high concentration of Hive.