Answer:
My first is in blood and also in battle. My second is in acorn, oak, and apple. My third and fourth are both the same. In the center of sorrow and twice in refrain. My fifth starts eternity ending here. My last is the first of last, Oh Dear.
I don't think or eat or slumber. Or move around or fear thunder. Just like you I look the same but I can't harm you or be your bane.
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
I have four wings but cannot fly. I never laugh and never cry. On the same spot always found, toiling away with little sound.
What does no man want, yet no man want to lose?
You use it between your head and your toes, the more it works the thinner it grows.