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.
It's in your hand though you can not feel it. Only you and time can reveal it.
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
What can be swallowed, But can also swallow you?
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
You use it between your head and your toes, the more it works the thinner it grows.