A team of elite warriors with mysterious powers enter a city immersed in a sandstorm. The opening to a cave leads to a hellish labyrinth of caves.
The fighters are: Ross, a man with strange healing powers, Billie Church, a witch who throws her blood in angelic writings to conjure fire among other things, Delgado is a convict who made a pact with a demon and can summon a flame spirit at will and Lieutenant Black who is a sniper and can control her bullets in air. That is just a few of the squadron.
When Ross dies in battle, his spirit can enter the bodies of others and control them. They all search for the firstborn, the first being created by God but then dismissed as a failure and sent to the abyss. They believe that destroying it is the only way to escape the hellish nightmare they are ensnared within.