Empyreans is a dark fantasy setting in a post apocalyptic world that may or may not once have had ties to our own.  What is known is this: after the cataclysmic world war, a rift was torn open in the planet and an energy began to seep out.  Everything this energy touched distorted, technology rendered useless, animals into monsters and plantlife into poisons.  There was one group that seemed to react favourably to this energy, and they found a way to convert it into magic - at the cost of sterility.

They built Empyrean City, the last bastion of culture and civility in a ravaged world.  There they infused their foundling youths with one of four types of energy: Choleric, Phlegmatic, Melancholic or Sanguine.  As each youth uses magic, faces off against the monsters of the world, the magic gradually changes their bodies to reflect their experiences.  Sometimes they become angelic, or bestial or nearly monstrous, but each one is unique, becoming something higher.  Together the Empyreans continue their pursuit of the arts and sciences in the hopes of creating a peaceful oasis to hold the miasma at bay.