I have a few questions about Eidolon Ally:
Does its upgrades use any kind of radiant or ascendant materials? Also, to get its final upgrade that requires crux of Crota, do you have to have unlocked the other upgrades?
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Ally needs Ascendant Shards to "fully" upgrade to the last bubble. Last upgrade bubble just requires the Crux. When you get the Necrocasm it is fully upgraded from the start.