The mission of the Four Horsemen is to search and destroy those that threaten the members of the Agana family and the Blue Country from their political enemies. This organization is currently led by the former Horseman of Famine, Nneka Araceli, who inherited the leadership over the four as an adult after the death of her then husband Immanuel Agana's grandfather.
- Famine: black, north, winter, water, air cavalry
- Death: pale green, east, spring, wood, sea cavalry
- Conquest: white, west, autumn, metal, colossal cavalry
- War: red, south, summer, fire, armored cavalry