Savathûn is in trouble because her Worm keeps wanting Sword-Logic ‘food’ while she’s wearing her Osiris suit.
That along with how she’s now an enemy of the Black Fleet makes me think we’re going to get help from the Pyramids to kill Savathûn (same as we got stasis to kill Eramis).
She’ll probably try to betray her Worm and the Sword-Logic (like the heretics of the Scarlet Swarm) — that’s why she learnt necromancy off of Nokris. She no longer worships the Darkness like Oryx did.
The Pyramids might make us their new ‘main man’ like Oryx once we kill Savathûn, as technically the Guardian will be the Taken King from killing all of the Hive Dynasty.
EDIT: in some final override dialogue between Mithrax and “Osiris”, Osiris ends the convo by saying “yes… the key to victory is in the light” meaning Savathûn thinks it can use the light or the traveler maybe?
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I actually think the opposite will happen. I think we’ll end up in an alliance with savathûn and help her break free of her worm in exchange for some sort of power. Mithrax says after an override mission that we should all come together to fight our true enemy, the darkness which is what I’ve been saying the whole time, although admittedly I’d never considered the Hive or Vex as potential allies. “Osiris” then interjects saying “you’d ally yourself with Savathûn?” Assuming Osiris is actually the witch queen in disguise, she now knows the possibility to work with us is potentially there. Savathûn wants free of her worm but beyond that, we have no idea what she wants, it’s possible that, when no longer a slave to sword logic, she could become an ally.