Answer:
I am a shower that lights up the sky
Golden treasure I contain guarded by hundreds and thousands. Stored in a labyrinth where no man walks Yet men come often to seize my gold. By smoke I am overcome and robbed then left to build my treasure anew.
What gets sharper the more you use it?
My teeth are sharp my back is straight to cut things up it is my fate.
I come off of a beautiful creature which soars in the sky. I come off of a peckish creature which has a tail as mighty as the sun! I am sometimes dirty and parents beg you not to pick me up.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.