The Four Horsemen of the End Times

According to Dalton Wood, the Four Horsemen of the End Times were four ancient mortals of unknown name and origin that were chosen by the Rainmaker to act as hosts to the four Primordial Aspects. Details of their acomplishments are unknown and it seem unlikely that they even existed together at any one point, since if they had they likely would've brought the world to ruin. They do, however, seem to appear as spectres that overlook any who use the Primordial Aspects. They seem particularly interested in watching Finnick, though he's apparently oblivious to them.