Well, we know she's gone. And we know that she's not coming back until Bungie decide that they want to wring our money out again. So, until then, does anyone have an idea where she [u]could[/u] have gone in the meanwhile?
I personally think she's trying to find the Queen. It's obvious that they have a connection and Eris is perhaps playing 2 sides, being a member of the Hidden and also one of Mara's agents.
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Reciting dark poetry, praising Dead Orbit, or saying she has a more personal grudge against The Hive....even though she hardly knew the fireteam she was with. Her Hive Teleportation spell would have come in handy when dealing with SpaceBane....but whatever. Unless that's retconned too.