Hello Sam. The embalming orb was discontinued and is no longer needed to upgrade the Husk. Once you reach 500 hive kills with it, you can freely upgrade the weapon. The next upgrade is with a Crux of Crota, which drops from Crota on Hard Mode.
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Hi man, thank u very much! your tips were true and it helps me a lot, now i just waiting for Crux of Crota, (I need a team to do the Raid :( haha )