Answer:
I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me. Lower light I never see.
Slayer of regrets, old and new, sought by many, found by few.
What is it that you must give before you can keep it.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
I can only be played on a windy day