No worries bud, he may mean the embalming orb from Eris you get to upgrade your husk to eidolon ally.
This doesn't drop or you can't get this from Eris anymore in yr2, but they made it so you don't need it. Once you have the husk and you kill like 500 give it will upgrade to eidolon and then you can use the crux to upgrade that to Necro.
I still haven't got the crux but have just and eidolon :(
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We're opposite, I got crux, u got eidalon. Give me your eidalon and I'll make two necrochasms, I'll trade you one (if trading was a thing)
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Lol I wish. Just do the Warmind mission when you get the husk, it's like a level 10 mission, you can kill 50 hive per mission so repeat 10 times and it should be upgraded to eidolon