There was no such thing as the Law of Destiny. By its nature, destiny was a force above the realm of laws, a power that stood in a higher state of existence.
As for the Concept of Destiny. It came to life due to the drive of the trillions of life forms that believe in it, many of them powerhouses that could sunder galaxies. However, describing it was hard, coming in contact with it was harder, and mastering it was technically impossible.
It would not be wrong to call an entity's destiny the sum of all things, past, present, and, more shockingly, it's future. If you had the power to manipulate a race's destiny, you could improve its fertility and make it so prodigies would rise one after another among its people.
Across his second, third, and fourth life, Zatiel influenced destiny in various ways. As the Singularity, he already became the center of causality, with every action he took generating ripples across the entire Prima Universe.
