In the tower if you wait long enough next to the Cryptarch he will say "take me with you."
English
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Also, if you give him 777 legendary engrams he may give you a legendary item. Just a rumour though.
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yeah other npcs also say that like the vanguard.
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My Legendary Engram decrypted into a Legendary item, when he says, "That wasn't supposed to happen.." Sounds about right.