Footnotes (or, of obscure facts and attempted creativity):
~*Finarfin indeed fought in the War of Wrath: ‘But the host of the Valar prepared for battle; and beneath their white banners marched the Vanyar, the people of Ingwe, and those also of the Noldor who never departed from Valinor, whose leader was Finarfin the son of Finwe.’ -- The Silmarillion
Finarfin’s peculiar armor and its subsequent donation to Elrond is solely an element of this story (no telling in canon if they even met).
~*Elrond was at least present during the War of Wrath – in his own words: ‘It recalled to me the glory of the Elder Days and the hosts of Beleriand, so many great princes and captains were assembled. And yet not so many, not so fair, as when Thangorodrim was broken, and the Elves deemed that evil was ended for ever, and it was not so.’ -- The Council of Elrond
I'm proposing that he was a successfully active participant in the war, along with Elros, and also got a young start.
~*Lake Evendim (Nenuial) as a safe haven during the changing of the landscape following the War of Wrath is solely an element of this story – I'm proposing the Valar (or someone, maybe Eonwe) knew that place would remain undamaged, and led the host there (who found refugees already in occupation).
~*The Grey Havens and Lindon were established at the beginning of the Second Age: ‘In Lindon north of the Lune dwelt Gil-galad, last heir of the kings of the Noldor in exile. He was acknowledged as High King of the Elves of the West. In Lindon south of the Lune dwelt for a time Celeborn, kinsman of Thingol; his wife was Galadriel, greatest of Elven women.’ -- The Tale of Years
It's my adaptation that Celeborn and Galadriel were among those in residence at Nenuial, and relocated to reign in south Lindon by invitation of the High King of that realm.
~*The Edain reached Numenor in the 32nd year of the Second Age – where they stayed before then is anyone's guess. For my purposes, I put Elros at the Grey Havens.
~*Maglor's line: 'Let him not vow to walk in the dark, who has not seen the nightfall' is said in canon by Elrond (The Ring Goes South); I thought it clever to imply he had learned it from someone who knew well the peril of oaths made lightly.
~*Remembered be waking upon a bed of niphredil as a stranger in a strange land. Niphredil is the flower that bloomed in Doriath when Luthien was born... 'and the white flowers of niphredil came forth to greet her as stars from the earth' (Silmarillion). If readers wish to perceive a resemblance of rebirth or an innocent nod to kinship, they have my permission.
~*Elrond's promise and his subsequent search for the Feanorions is entirely the author's imagination hard at work. He was Gil-galad's herald though: 'I was the herald of Gil-galad and marched with his host.' (The Council of Elrond)
Last Note:
Elrond's line: 'Time was when a squirrel could go from tree to tree from what is now the Shire to Dunland west of Isengard. In those lands I journeyed once, and many things wild and strange I knew' (The Council of Elrond), was what sparked the inspiration to write this story, and for it among other things I thank Tolkien.