Interesting, interesting... good, inventive ideas - at least some... though, Beleriand is not the right answer. As I said earlier, the riddle goes chronologically (except for the "opening" lines), so "Death of stars" must have preceded to "They will come to me", which, in the case of Beleriand as you present it, was not true - the Valar came and THEN the Silmarils were cast to the Sea, fiery chasm, whatever. Also, Utumno was definitely further north - maybe Angband, but still, Beleriand was, as I understand it, the name of the land between Ered Engrin and Ered Luin and the Sea, so Angband itself wouldn't count in it... but in something, you are on right track and again one step closer - though I might say that you didn't retain the points from before
