Answer:
What holds names and memories which are not its own?
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
Break it and it is better, immediately set and harder to break again.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?