Answer:
People want it, and when they have it, they use it by giving it
What sphinxes employ and players enjoy.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
I'm a god. I'm a planet. I measure heat.
They can be long or short; they can be grown or bought; they can be painted or left bare; they can be round or square.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?