I had this thought this morning: what if the queen’s hidden friend is in fact Cayde-6...? He did help us get on the dreadnaught behind the vanguard’s back. And now he seems to be in charge of our return to the reef.
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Definitely Eris, Ikora says she is one of the Hidden and you can see Eris talking to the Queen in the cutscene after you defeat Oryx and she gets the Shard of Willbreaker