[Gil-Galad]

what i meant by them having to remain in limbo, would be that the nazgul's spirits are to far past redemption and must endure the agony of being in Limbo, being alone, ignored, and unthought of, and much watch everything that happens and can't do anything about it.


so basically they were to evil to be given a final rest and their spirits must wander the earth for eternity. almost like common day ghosts if you will.

oh and technically they weren't dead, their lifespan just basically went beyond normal due to Saurons malice, the Nazgul's human bodies corroded away but their Spirits, that were entwined with Sauron, remain, so if we are speaking teachnically, the Nazgul aren't dead because they never died, Their Souls are still there to take the place.