Thank you! This Námo-Caranthir mind-link started with a fic I've erased: In death's shadow, where they end up together and with Vaire. There was also a small sequel, where Feanor meets his grandchildren. :)

I kept the mental link part, an there are two fics where I use it:

Brothers
The Halls of Mandos

So you can read about their link there.

There is a reason for that link, but I have yet to write that fic. =)

And yes, it was terrible for him to die for nothing. He was, I believe, content in Thargelion.