Your soul is chaotic and untamed Hot Black Flame, the soul of a Devil. You are a Masked being of Immortal Chaos whose natural home is within the void. At the onset of this power you may design the look of your basic mask, as well as your name. With your ascension and mask creation you also get to choose a single word name. Binding with a mask grants them sentience, memories, a personality, and the ability to enter a world rather than being stuck in the void. Devils may "change" their own names or trick mortals into renaming them. The higher coloured names of devils are powerful and kept exceptionally secret, and usually (though rarely) discovered by devils themselves. While you start as a blue Devil with this power, and have a long enough name appropriate for such a being, knowing your ebon name allows you to have much more freedom and ability that your average blue devil. You also do not suffer from the drawbacks of certain devil types like normal devils do, such as the different mind states and thought patterns different devil colors might have, though you can indulge in those instincts without issue should you wish to.
As a Devil you start out as a Blue devil and must work your way up through the colors, losing portions of your incredibly long name in order to reach higher colors such as red, green, gold, and finally ebon the strongest and most capable demons. There is also a lesser form of devil below Blue devils known as Pale or Pallid devils, however these devils, while they have their advantages, are limited in their mental capacity and will compared to even weaker Blue devils.
Blue devils are physically weaker than other devils, but their natural cunning makes them gifted at the Art. Red devils are warhorses of strength and stamina that never tire. Green Devils have the cunning and complex thought of a Sphinx, but with reptilian features and ferocity. Gold Devils have the mental capacity and psychopathy to run criminal empires, underground and state alike near single-handedly, and Ebon devils combine the mental and physical fortitude of all of the devils before as well as being able to freely shape their form almost like an unbound devil can. A devil's power in the art grows with each step closer to Ebon devils, at which point their very voice becomes a weapon — a language that inflicts not only pain but also cleaves through matter, asserting their dominance over the fabric of reality.
The way that a devil improves the color of their mask is by increasing the amount of black Atum they have in conjunction with removing names. They do this either with power, or through tricking humans into misnaming them with shorter or different names. By making a pact with a being you can leave a small portion of your black flame on their soul which will allow you to absorb energy from them for the duration of the pact, you can choose to have your energy draw from any energy source intrinsic to the contactee if they do not have black flame of their own. The leftover spark of black flame can be fed into for increased power gain, as well as beginning the process of transforming the afflicted person into a Devil themselves. This small and possibly growing spark of black flame gives the Afflicted the ability to use the Art as well, however this use of the black flame will accelerate their transformation into a Devil
As a devil you can choose to separate your mask from your body, which can then be worn by a living person. This allows your bodies and wills to attempt to emerge, however this is rarely done by either devils or willing people since the merge can create a strong clashing of wills if the merged people cannot work together, it can also be dangerous for the person attempting to wear the mask as the transformation and powers draw on a lot more energy and could cause a weak host to burn up under the strength of the Devils Atum. With the knowledge of your ebon name and your greater control over your Devil Instincts you are able to better control the effect you have on beings that you are merged with, reducing the impact of your power on them, or how much your wills clash by instinct.
Unlike your other devil kin, if your mask is broken apart and you are banished back to the void as mindless chaotic blackflame. It may take some time but some small portion of your mask will reform or appear in the void near you will name and bind you as a pale devil that is guided to find other pieces of its mask. While this immortality is true, it is not impervious to other means such as binding or entrapment, and will almost certainly not be quick.
If you walk the void long enough, you will eventually find distortions that access some physical location in your world. You can use these to pass through into the real world as a Masked Devil.