Answer:
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
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.
When the horse strokes the cat, the wood begins to sing.
What begins and has no end? What is the ending of all that begins?
It is destruction made out of thin air, You hear it howl and give a prayer, Through barns and houses it will tear. It is a deadly funnel, Of violent and twisting air.
I have two eyes in the front and a lot of eyes on my tail