The Calavera Warrior born under a morning star's gloom, Roves the path of obsidian doom. A twin monstrous lifeblood, The mestizo wars with anger and blood. Upon the eighth hour of the night, all will become undone, And the Mountainheart will sway aloft, for this weird tale has just begun... A monster has cast out the jaguars and cursed the small, mountainous town of Berumbo in a deathless winter. Haunted by the monster's hunger and old superstitions, the surviving townsfolk recruit the sinful, a band of bounty killers, to deliver them from perdition. Xolo Guevara, a young mutant and outcast who runs from his own dark past, is one among the trio of bounty killers. And soon, beneath the subterranean chambers of a preternatural tower, Xolo will not only battle the lurking monster but also the nightmares that haunt his damned soul.