Normally I'm not big on reporting spoilers, since I happen to post a lot of them (properly marked, of course) and hint a lot, but a noob just posted a pretty big one in the Episode 161 discussion thread. It's post # 136 and both elfie and I have called him out on it.
I am the bone of my sword.
Steel is my body and fire is my blood.
I have created over a thousand blades.
Unknown to Death. Nor known to Life.
Have withstood pain to create many weapons.
Yet, those hands will never hold anything.
So as I pray, UNLIMITED BLADE WORKS.