Answer:
Only one color, but not one size, stuck at the bottom, yet easily flies. Present in sun, but not in rain, doing no harm, and feeling no pain. What am I?
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I am born in fear raised in truth and I come to my own in deed. When comes a time that I'm called forth I come to serve the cause of need.
The more you have me the less you see. Shine a light on me and I shall flee.
Deposit red liquid in me.
The more of me you take, the more I appear behind you. What am I?