Then Hrungner thrust the shield under his feet and stood on it, but the flint-stone he seized with both his hands. The next that he saw were flashes of lightning, and he heard loud crashings; and then he saw Thor in his asa-might advancing with impetuous speed, swinging his hammer and hurling it from afar at Hrungner. Hrungner seized the flint-stone with both his hands and threw it against the hammer. They met in the air, and the flint-stone broke. One part fell to the earth, and from it have come the flint-mountains; the other part hit Thor’s head with such force that he fell forward to the ground. But the hammer Mjolner hit Hrungner right in the head, and crushed his skull in small pieces. He himself fell forward over Thor, so that his foot lay upon Thor’s neck. [...] When the asas learned that Thor had fallen, they all came to take the giant’s foot off, but none of them was able to move it. Then came Magne, the son of Thor and Jarnsaxa. He was only three nights of age. He threw Hrungner’s foot off Thor, and said It was a great mishap, father, that I came so late. I think I could have slain this giant with my fist, had I met him. Then Thor arose, greeted his son lovingly, saying that he would become great and powerful; and, added he, I will give you the horse Goldfax, that belonged to Hrungner.

- Prose Edda (Thor and Hrungner)