The power to bring the dead back to life was a power that should only belong to the supreme existence; the absolute one, the overlord that could overwhelm time and space in order to twist reality at will and change the natural rules not only of the universe but of life in general.
The same applied to the power of creation. Creating life was not as simple as building a television set because to create life first and foremost required a essence; a soul. But how was it possible to create a soul? After all, the way each and every soul evolver grew, regardless of race, was by absorbing part of the Soul Power of another existence.
In case someone had the ability to create souls at will, wouldn't that someone be able to continue evolving infinitely at lightning speed?
