So far, episodes have revolved around an old, not so powerful enemy making a return in possession of an Echo, making them quite more powerful.
We know Nokris is alive and was under Savathun's command for some time, we know Lucent Hive tried to resurrect Oryx in the Ghosts of the Deep Dungeon.
So, I think it is obvious that Heresy will be about Nokris using an Echo to resurrect Oryx, considering resurrection is <Heresy> for the Hive, and thus finally fulfilling Savathun's prophecy of the Taken King rising again.
Also, our returning allies, will obviously be Zavala, Savathun, Queen Mara Sov and maybe Drifter/Elsie Bray, considering it's been 1 Vanguard Member and 2+ other characters so far, per Episode.
Any thoughts?
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Nokris wouldn’t need an echo to bring back Oryx, he has necromancy. Plus that would require the echo to very similar to the current, which is kinda redundant. It could go to/brought to Oryx and revive him itself, being part Light, but have a wholly different function.