AU by Akuryuu
explanation:
so basically, since furina was able to be immortal from focalors, I think, well it also affected nikolai somehow, so he was able to live long like his sister, and nikolai doesn't live in fontaine he lives in snezhnaya and still is a t3rOrist with
the decay of angels and furina
doesn't know that about nikolai also no one else knows about furina or nikolai having a sister. they both miss each other but nikolai knows kinda what is going on in fontaine. oh, also, all the decay of angels are immortal because they got a substance for it. there are still abilities but some in the room heard something about it but are not sure what it is. the fatui and decay of angels are mostly enemies.
(This next part is mine)
Furina thinks Nikolai is dead as she doesn’t know that he is also immortal as they hadn't talked for year's. Furina knows about nikolais ability she thought that he was crazy so they stopped talking. Though they both miss each other
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