"He (the giant king) would have liked to tame the very fire at the heart of the earth if he could in order to make the pillars for his throne room."
And what does "tame...the heart of the earth" mean?
I found that "to tame" means "to make a piece of land, a river etc able to be used ". But how the giant king wants to use the heart of the earth for the pillars? Is it a real magma? Or deeply buried stone? I don't get the meaning.