Prologue

The 4 horses of the apocalypse:
War: can set enemies on fire
Pestilence: nearly impossible to kill
Famine: fastest horse there is
Death: explodes zombies heads

These horses are summoned by Ayauhteotl, the Aztec Goddess to put the mask back where it belongs and to put an end to the undead hordes and set their souls to peace. But these horses have the power to shift into a human if they wish.