“Dominion” is a grand supernatural drama unfolding in the not-too-distant future, precisely 25 years following “The Extinction War.” This conflict saw a legion of lesser angels, led by the archangel Gabriel, launch an assault on humanity. In a surprising turn, the archangel Michael defied his celestial brethren to ally with humans. Emerging from the devastation of this prolonged conflict are fortified cities that serve as sanctuaries for the remaining human population. Central to the narrative is Vega, a shining metropolis that has risen from the remnants of the former Las Vegas.