Answer:
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
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.
Big as a biscuit, deep as a cup, but even a river canβt fill it up. What is it?
What has 4 eyes but canβt see?
A nut cracker up in a tree.
If you can spot one of these eastern warriors, it means they're not doing their job right.