Answer:
What is the only letter in the alphabet that does not appear anywhere on the periodic table of elements?
What can go through glass without breaking it?
What is never used unless it's in a tight place?
My first is in wield, sever bones and marrow. My second is in blade, forged in cold steel. My third is an arbalest, and also in arrows. My fourth is in power, plunged through a shield. My fifth is in honor, and also in vows. My last will put an end to it all.
Jack and Jill when up the hill jack fell down
You use it between your head and your toes, the more it works the thinner it grows.