There are many legends and fairytales of Remnant. Few are true, The Four Maidens, The Two Gods, Salem. Another set of legends include the Guardians. Four legendary warriors who serve as the Four Horsemen of the Genesis.
War, the Warrior clad in red. His teacher, former horseman Nightmare. He's said to be able to clear a large group with just a swing of his great sword, or turn the minds of humanity against each other.
Famine, The Warrior in Cloths. His Teacher, former Horsemen Cervantes. He's able to seize the foods of kingdoms in a single snap, or steal the life from someone by just stabbing both his daggers into them
Death, The Reaper Clad in Black. His Teacher, former Horsemen Zasalamel. Able to steal the souls of his enemies and use them as allies, or cut through the hordes of enemies like wheat.
And Conquest, The Ranger in White. His Teachers, Grøh, Kilik, former soul fighters and Horsemen. Able to obliterate an army with a single arrow of his bow, cut through armies with his duel swords, or non lethally destroying his enemies with a staff.