The greatly exalted sun, when fatigued is known as the Prashanta (fire). He created the fearful Asura and various other creatures of the earth.
प्रशान्तेऽग्निर्महाभाग परिश्रान्तो गवां पतिः। असुरान् जनयन् घोरान् मांश्चैव पृथग्विधान्॥