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The Supreme Deities that inhabited the vast Galaxy of Nyx were many, their power often limited by the amount of Solar Systems they owned and the power they could draw from it, of course, the strongest of them all would grow even stronger to the point that they would get past the Supreme Deity Realm, and reach even further beyond that.
However, such entities had a completely different approach to their cultivation, and were not going to be addressed here… the Supreme Deities were the entities within the Galaxy that usually served as the servants of these beings, being given a Star and its Solar System to take care of while the planets on it were nourished over the years from the life they possessed.
A planet was capable of acquiring large quantities of power by absorbing the energy that the living beings on it produced, naturally forming cores, the strongest and most beautiful of cores would then be picked up and something mysterious would happen to these.