Answer:
You use it between your head and your toes, the more it works the thinner it grows.
If all Wibbles are Criggles, all Borkins are Kwumblins, no Hoggles are Borkins, and all Criggles are Borkins, is it true that all Borkins are Criggles?
I have split the one into five. I am the circle that few will spy. I am the path that breaks and gives. I am the bow no man may bend.
In your fire you hear me scream, creaking and whining, yet I am dead before you lay me in your hearth.
There is a creature of God whose body is hardΝΎ it does not wish to eat unless you strike its head.
I have two eyes in the front and a lot of eyes on my tail