All energy in a universe come from the orgin of that multiverse. Weather it be a Tree of Life or something else. But the void currupts some of that enerfy lowering the purity. The more pure the energy the stronger the universe god is and the stronger the creatures that come from the universe are.
Most universes have a average purtity of about 75%. Higher grade purity would 80%. Extrordinary universes have around a 90% purity. After 90% is when the gods and creatures experience massive growth and power boosts compared to creatures of less pure universes.
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When a Void God or Soveriegn Void God wants soldiers they usually make them within high purity universes.
The highest recorded universe purity in the True God Plane was 96.3572652343091%. That universe was destroyed in a war over it leaving the next highest universe with a purity of 95.6231879230232112%.
The sabitlity of a universe is how useable the energy is. For instance even a universe with 99.9999999999% purity would be worthless if it had shit stability as none of the energy would be usable for creature growth nor would creatures beable to exist easily.