Magic Sources

After The Rupture magic returned to earth. Those that learned how to use it would channel their power from one of the elemental realms, mainly Void and Lumin, since these two realms where the ones connected to Earth through the rifts that formed. The humans learned how to use magic, either through studying or a natural connection (through birth or divine devotion).
  With time, the races of the lumin and void realms (especially the ones with shorter life spans) stopped caring about the conflict between the two and chose to channel through a realm other than their own. Even though these void or lumin born decided to follow a different path than their ancestors, one natural law remained: lumin and void magic cannot be channeled at the same time.
  The elders of the realm races will tell you it is because of the ancient history between their deities, but to any modern person this reason is part of the old myths that don't belong in the world anymore. The neo people will say that the reason for this is probably because these two elements are such opposites that the body rejects the one if you are channeled to the other. Anybody that channels either void or lumin can still use any of the other 6 elements, though.
The eight magic elements are:
  In addition to the elemental sources, all magic can be divided into 8 schools of practice, or application. These schools categorise spells according to their use and their nature. The 8 schools are:
 
  Void users cannot use any healing magic and lumin users cannot use most of the spells from the Necromancy school. Also, within these schools, there are spells that deal radiant and necrotic damage. Void users cannot use the radiant spells and lumin users cannot use the necrotic spells.
  Magic became a fundamental part of living in the years after The Rupture, woven into the power supply that the people use in their homes, healing in the hospitals, combat technology and more. Magic is very common in every day life, and yet, many people don't posess this great gift.
Some people become so desperate for this gift that they study for years, make deals with powerful entities to wield it, or they adopt a deity to receive it. All these methods come with a price, though. Whether it be in time, morality, freedom or sanity.
There are races that are born with the gift of magic naturally. There are people within these races that did not receive it and become more desperate than most to acquire the gift. These naturally gifted races are elves (luman and void), lumunai, chaos kin, tieflings and vampires. Tieflings were created only because of humans' desire for power and magic.