The Reborns are people that for any reason, have died. Either due to an accident, murder, starvation, illness or in a natural way. All have died. But by some inexplicable event, they soon returned to life … with supernatural abilities that control at will.
These powers they acquire are known as Rennus, and always derive from some detail of the moment of death. It can be a last thought, the way in which it dies, something in the environment, a feeling, etc. In practice, it is as if they themselves become a Magite, able to control almost without training the shape of a Basal.
In addition, the experience of dying produces to the Reborns at least a remarkable physical change, a mutation derived from Basal that dominate. So, for example, someone who controls the Lava Form, will always be very hot, or someone who dominates Nature will have hair of vines or whoever dominates the Smoke will need to breathe toxins.
Adding that the Resurrected can not use sorcery or manipulate Magites, the magical overload that must exist in their bodies rejects other sources of magic. It is the same thing that happens when trying to join two magnets by the same pole, they repel.