Answer:
I am nothing really at all, Yet I am easily foundΝΎ Ignore me at your own peril, and you might end up crowned!
I can ruin your day, or darken your life. And while I'm expected, I'm never alright. I'm bad for business, and worse for your hair. Wherever I am, there's something not there.
The more holes you cover the lower it goes.
This only turns over once you have traveled very far. What is it?
A certain wizard resided in a city made from this gemstone.
You use it between your head and your toes, the more it works the thinner it grows.