Answer:
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
My days are numbered. What am I?
The shorter I am the bigger I am.
I am needed for most animals and hardcover books
Cloud is my mother, wind is my father. What am I?
A man goes out in heavy rain with nothing to protect him from it. His hair doesn't get wet. How does he do that?