Answer:
A dragons tooth in a mortals hand, I kill, I maim, I divide the land.
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
The eight of us move forth and back. To protect our king from the foes attack.
I sleep by day, I fly by night. I have no feathers to aid my flight.
What is as big as you are and yet does not weight anything?
It produces a flower but it is not its fruitΝΎ it produces branches which are its fruit.