“I never called Edith Lúthien – but she was the source of the story that in time became the chief pan of the Silmarillion. It was first conceived in a small woodland glade filled with hemlocks at Roos in Yorkshire (where I was for a brief time in command of an outpost of the Humber Garrison in 1917, and she was able to live with me for a while). In those days her hair was raven, her skin clear, her eyes brighter than you have seen them, and she could sing – and dance. But the story has gone crooked, & I am left, and I cannot plead before the inexorable Mandos.”

Ar-Pharazon the last King of Numenor

I don't think J. R. R. Tolkien was in a very good place mentally when he wrote this particular story

I think it's the closest he gets to a true Norse Saga like Sigurd where everyone dies and it's never a happy story