 The gods then call the thunder-god Thor to expel the unwanted guest, and the two of them agree to a duel.Thor arrives at the appointment with his servant Þjálfi, and Hrungnir is escorted by Mokkurkálfi ('Mist-calf'), a mighty creature made of clay, and with the heart of a mare.But the giant Mokkurkálfi is said to be "quite terrified" and he "wets himself" at the sight of Thor, whereas Hrungnir, whose heart, head and shield appear to be made of stone, is "standing unguardedly".