The main themes of echos were LGBT relationships and control.
The main themes for Revenant so far seems to be single parent house holds/daddy issues and racism/xenophobia (it's shown in the intro cutscene and mention a few times by Mithrax)
Given that these are largely left leaning talking points we can assume that Heresy will likely have abortion and immigration as the main themes.
So there is a good chance Savathun will ask us to abort Xivus worm like we did hers, then using the Ahemkara she possesses, restore fundament for the lucent hive to return to. Meanwhile the guardian will be exploring the dreadnought trying to find a way to deport the lucent hive back to their home world.
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Another current events theme seems to be the plague that Eliskni are suffering from and the recent pandemic and other dangerous diseases on the rise.
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So are you talking about people returning to all the spanish named parts of the U.S. from southern countries? I can't tell what that last paragraph is trying to say.
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The Final Shape cutscenes showed Eliksni&Humans living together peacefully, I don't think it's about Xenophobia anymore It could be about poverty, Miisrax did point out Ikoras half assed philanthropy by inviting them here , and making them live on scraps , when we have the means to change that, there was even a donation drive, and out of the billions of glimmer and resources that was raised, they bought...drumroll............a single set of stairs, We need to see some receipts Ikora And it's also about Eramis overcoming her Xenophobia , she will be an ally by the end of the season, if she isn't killed by Fikrul and in her dying breath, tells her people to follow Eido