It will depend on our 2nd Age storylines whether or not that will be an appropriate gift. And obviously, the 2nd Age is the murkiest and most lightly sketched, so it's fairly open-ended right now.
Possible ways Narsil can get to the Lords of Adunië:
- Gift from the King of Numenor to the Lord of Adunië
- Gift from the elves of Tol Eressëa to the Lord of Adunië
- Gift from Círdan the Shipwright to the Lord of Adunië
- Other?
We spent most of the time during the Session considering the first option, and thus the effort was to put Narsil into the hands of Elros. But, there are alternatives where Narsil does not have to come to the Lords of Adunië via Elros, so we can consider those options.
So far...I've not really heard any good story of what Narsil was used for during the First Age. IF we can come up with a good use for it, it will be easier to trace its future journey.
Narsil is made by Telchar of Nogrod, some time after the rising of the Sun. We have depicted Telchar working closely with Thingol to arm the elves of Doriath, and therefore the most obvious starting point for the sword is there. Should it be Mablung's sword? That would explain why it's not overly famous - Mablung didn't exactly have a lot of famous deeds.
But we also know that the two other items Telchar made (Angrist and the Dragon-helm) wind up far afield from Doriath, and pass through multiple hands. Why would Narsil be any different? Notably, both of those items end up in the hands of the Fëanoreans fairly early in their stories. So....why not Narsil, too? We know that none of the Sons of Fëanor had named blades (at least, no names are recorded). But why not make Narsil Maglor's sword in Beleriand? I realize that making Narsil an instrument of Kinslaying taints it, in a way, but, well...why not? Also explains why someone would think it should go to Elros at some point. And since Maglor doesn't die, he can renounce the blade at some point, giving it up voluntarily. Anyway, we could do something with that.