Answer:
Against the sun I protect your eyes and am often worn on the face of spies
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
I flow from the Homerβs mouth when he sees doughnuts.
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.