Answer:
I sleep by day, I fly by night. I have no feathers to aid my flight.
Creatures of power, creatures of grade, creatures of beauty, creatures of strength. As for their lives, they set everything's pace. For all things must come to live. Under their emerald embrace Either in their life or in their death.
In the evening I'm long, in the morning I'm small; When seen in a ballroom, I'm nothing at all.
When I live I cry, If you don't kill me I'll die.
A certain wizard resided in a city made from this gemstone.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?