AU = alternative universe
WHAT IF :
After Nesta & Cassian are married, they split up - you can say it was because they were put in an impossible position like Helion and the Lady of the Autumn Court OR Rhysand’s war plans with Koschei tear them apart OR something happens that makes Rhysand say F U to Nesta even though he owes her his and his family’s life and yeets her from the Night Court OR you decide
THEN Nesta is cast back to Prythian, but Rhysand isn’t HIGH KING, so he can only really keep her out of ALLIED lands, if that (cause our boy Helion still wants a slice).
SOMEHOW, Nesta and Eris find each other in Spring Court whilst Tamlin doesn’t have himself together and start chatting prior to Cassian or whoever decides to show up for their secret meetup.
The two chat it off and Eris convinces Nesta to head back to the Autumn Court with him, therefore missing his secret meeting (subtly telling the Night Court to piss off by doing this)
Lord Beron MEETS Nesta, and they end up playing MASSIVE court politics during her entire stay there, but she’s fed and clothed
In secret, Nesta and Eris are planning for his take-down BY THEMSELVES, aka without the Night Court and outsiders
Nesta being the “witch” she is, creates a potion to enhance Eris’ powers that can only be made once (obviously)
PLUS, Nesta is still in control of an ENTIRE Dead Trove and steals it from the Night Court's possession the moment Eris sits on the throne as High Lord.
They attack during a ball celebrating their coming union with Autumn Court officials/royals/nobility and SUCCEED
Eris is now High Lord of Autumn Court
High Lord Eris has the entire remaining court’s attention and states his future wife is Nesta Archeron
The marriage ceremony would take place the next day leaving little to no time for interference.
He marries Nesta and announces it to the world AFTER THEY HAVE WED even mentioning that Nesta currently possesses the Dead Trove (it’s politics, after all) - they kept it quiet since everyone in the Night Court thought Nesta was still in Prythian or managed to leave the continent or whatever
Maybe even Nesta becomes a High Lady herself
The two already have Lord Keir and the Court of Nightmares in their pocket
The Valkyries decide to stick with Nesta over the bargain they made or make. #girlpower #alwaysstickingtogether #newfamily
The alliances between the Night Court and other courts would now be vulnerable
Each court must decide which court to pledge allegiance to
Autumn Court - Risk death by Nesta with the Dead Trove and Eris’ growing flames
Night Court - War from the Night Court
High Lord Eris & (High Lady) Nesta seeing each other as equals in power (you could say the two fell in love or hold equal blackmail on the other therefore never betraying one another), gather allies from across the world without the Night Court, until THEY become THE ultimate power.
Meanwhile, Cassian is fuming about Nesta being with Eris especially after he called the man a coward for not already killing his abusive father (like okay Cas, not everyone can/will do that)
Mor & Cassian get into multiple fights about what he sees in her other than being his mate to the point the entire IC gets involved.
Amren is saying stuff like, “how typical of Nesta to only think about power and herself” but you’d mix in Nesta being poorly treated by the Night Court a month after her mating ceremony - Why? You decide
Elain as a Seer already knows which way this will end, but keeps her mouth closed
Feyre tries sending letters to her sister, Nesta, but after the first few, all letters from the Night Court are burned without regard to their contents (this could be a Lord Beron order or simply out of safety or whatever).
Rhysand is having to plan a hostile take over as his enemies start popping up from all sides of the globe, enemies Nesta & Eris will have to face as well.
Azriel is working himself ill to keep the Night Court as up to date on foreign and domestic issues
THEY BATTLE Koschei or whatever other evil comes up and take him or them DOWN together
End of the war, Nesta ends up PREGNANT! with Eris’s baby (no affairs shall be had here)
Slowly, but surely, the Night Court loses power and crumbles itself from within as the new leaders of Prythian arise (this can be before or after the final battle).
Epilogue - X years later, Eris & Nesta are a formidable force with a massive kingdom and talented offspring that inherited their gifts (you decide which ones)
HIGH KING AND QUEEN, Eris & Nesta
I think this would be very cool to read.