Answer:
Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
A horrid monster hides from the day, with many legs and many eyes. With silver chains it catches prey. And eats it all before it dies. Yet in every cottage does it stay. And every castle beneath the sky.
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
It is a path of cow juice spread across the sky but cannot be seen by the naked eye
People take me on walks and I run and have fun. What am I?