'Fragment Bearers are powerful because they manipulate the energy that defines existence. Primordials, their benefactors, they're the ones that make our worlds what they are today.
Time, for instance, affects everything around it. Fire, and even Wind, the most unstable element that ever existed, has to obey the laws of time and space.
Fire cannot exist without emitting light, nor can it be recognized unless there was darkness around. You see, the Primordials exist all around us. Every second you breathe, it's because Aella had provided you with all the elements that make life possible.
When you die, Qil'Al decides where your fragmented soul goes. Do these powers exist because we've allowed them to? Or did they exist before we even knew what life was? There are too many questions you could ask in order to understand all this mess.