Answer:
What sphinxes employ and players enjoy.
It could make arrows fly and kites soar. What is it?
What object has keys that open no locks, space but no room, and you can enter but not go in?
What is full of holes but still holds water?
Soldiers fight it but never changes.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.