"Thick, dark clouds were rolling toward the horizon. This battle would outlast the sun, as the coming storm raced across the sky like Sköll to devour its light. Einar saw the shape of a wolf’s head in the clouds, which he found disturbing in light of his observation. The gods were truly watching this day, he thought. But the thought of the raging tempest overhead fueled him, encouraged him. A horn blew nearby, sounding of thunder; the call to arms."

-(Vi)Kings