Nazgûl Theme

[Birdland]

I'd always thought it was Merry. Borrowing from the quote above:

No other blade, not though mightier hands had wielded it, would have dealt that foe a wound so bitter, cleaving the undead flesh, breaking the spell that knit his unseen sinews to his will

So it seems that only the blade that Merry bore was capable of actually destroying the Witch-King's "body", or Life Force if you like. Technically, the Nazgul was already dead when Eowyn dealt her stroke, and it still broke her weapon, anyway.

And as for the Prophesy; well, Merry is a Hobbit, not a man, thank you very much.

All hail Meriadoc, Slayer of the Nazgul!