The end.. is when all things cease to Be. [hums, briefly.] The immortal spirit of an Elf returns to Mandos, and is reborn in Valinor, the Undying Lands, to reunite with friends and family. But the spirits of mortals do not share this fate.

Luthien has forsaken her immortality, and thus, the Undying Lands. She will have Beren with her, but she will never again see her father, perhaps not even her mother, nor any of her people.

[not that he quite expects roy to understand. it's a different world, after all.]