I've done a bit of revising to Magical Warfare, so I thought I'd update the info from my earlier post.
The creatures of light are still the Gods, or the Shinzoku. The creatures of Darkness are still the demons, or the Mazoku. The major difference is each Shinzoku and Mazoku has a rank to show who they were created by and what their power is. (A god or demon that creates another god or demon can only create that god or demon that is half as strong as him/her.)
The highest of the Shinzoku and Mazoku are the Legendary Rank. They are the first of each species, and they are the only god/demon to exist in both Infiniverses. They are the strongest of the strongest, however it isn't impossible to defeat one if you're weaker than them.
Those created by the Legendary are the Ancient Rank. However, even though they over rank the ones after them, they do not ever create them.
Those under the Ancient, but not created by them, are either the Saint (For Shinzoku) or Devil (For Mazoku) or Saint-Devil (For Shinmazoku, which are considered almost non-existent) Rank. These are more common than most believe; they are more independent and act more like leaders since they are born when a mortal proves themselves worthy. And their powers can be passed onto their servants. Such as how if one Saint Shinzoku possesses the power to wield multiple elements, he can make each of his servants based off one of the elements.
Those created by the Saint/Devil are known as the Elite Rank. Elites usually act for their master in their place when they themselves can't be there.
Those created by the Elite are the High Rank. They act similar to how Elites work for their masters, but are actually fewer than Elites since they more commonly only are created when an Elite needs some backup only he can use and another Elite can't.
Any Mazoku/Shinzoku that's 'born' and not 'created' from any of these ranks is ranked another way, the parents and their ranks decide the child’s rank, for example, two Saint Ranked Shinzoku will produce a Elite Shinzoku as when breeding the lowest rank out of two minus a rank equals the offspring’s rank such as a Devil Rank and a Elite Rank would make a High Rank, however a Parent may give the amount of power a created servant (as if they made another) to the child as seen in a chapter of Magical Warfare which they may also give to another. This is possible because since a child isn’t tied to a master in power they can give their power to another individual.
Shinzoku and Mazoku both take the appearances of humans. Ironically not all Shinzoku are good, and not all Mazoku are evil, it depends on how a god or demon uses his power that determines their alignment. Shinzoku/Mazoku hybrids are known as Shinmazoku, more commonly called a Demonic God, however they are considered myths as not even a Mazoku and Shinzoku breeding has been able to successfully create one. But one person knows exactly how to make a Shinmazoku.