Excellent imagery! Snow singing death songs of silence is a very alliterative phrase, and a very apt one too. I loved the repetition, and the final variation "And as wing with the snow...".

Also, you captured the strange heart of the Nazgul very well: perhaps we did not feel the chill/Perhaps we never truly will".

This is an excellent poem!

Hey I really like your poem. lol keep it up!:)