Ar-Pharazon and the separation of Valanor

[Morthoron]

Originally Posted by Hot, crispy nice hobbit

Back to the topic, Ar-Pharazôn and his army may have faded like the Ringwraiths. Or died and became ghosts like the Ghost Army. It's also possible that they're still alive though, since they'd set foot on the "Undying" Lands.

Tolkien was quite implicit in his letters that merely being in Valinor does not confer immortality (the inhabitants, the Elves, Maiar and Valar were immortal in the first place). Frodo and Bilbo certainly died after a period of time living in Aman. The 'Caves of the Forgotten' implies a purgatory or limbo where spirits reside until the end of time. So, I would say the Numenorean army did indeed die, and their spirits will rise again for the Middle-earth version of Ragnarok (where dead folks like Turin will join in the battle).