Embalming Orb
From Destinypedia, the Destiny wiki
The Embalming Orb is an upgrade material used to convert Husk of the Pit into Eidolon Ally. It can be purchased from Eris Morn for glimmer and 10 Black Wax Idols, but requires reputation rank 3. After The Taken King update, Embalming Orbs are no longer available.