Devils

History
Devils are a unique, dualistic kind of creature in the universe. When a truly wicked person dies, their soul is consigned to the divine prison known as the Pit. At the center of the Pit is the prison of the fallen titan, Aurelius, known in modern times as The Great Adversary. Aurelius reaches through the bars of his prison and takes these wicked souls. What happens next depends on who you ask. If you ask one of the gods, he twists and warps the souls until they turn into the foul, evil creatures known as devils. However, if you were to ask a servant of Aurelius, they'd tell you that the Titan's infinite love and compassion for humanity touches the irredeemable soul and gives them a spark of his divinity, imparting them with a second chance for redemption and the power to escape their prison and manifest a body.

Whichever of these two views is true, the devils that first escape the pit are unquestionably evil. When left to their own devices, the devils tend to amuse themselves by corrupting and/or tormenting mortals. However, they also carry out the will of Aurelius when he commands them. The orders they carry out are often apparently random, all part of the First Smith's master plan to return humanity to its happy, primordial state of anarchy. Throughout this process, Aurelius attempts to redeem the souls of the devils who serve him, sometimes sending them on missions designed only to teach them empathy. Once redeemed, these souls cease to be devils and pass into Heaven, making this endeavor harmful to Aurelius's overall goals - the devils that redeem themselves tend to be the most powerful.

Physicality
Devils find humanoid forms the most natural, being fallen human souls. However, their unique origin means that they have no set physical form, and often select whatever shape seems the most appropriate to their goals. They often switch between a set of appearances in order to confuse the humans around them and make their actions harder to track.