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Evolution, something that monsters, demons, spirits, and even humanoids are capable of undergoing. Usually, it is by reaching a certain point in their power in which their bodies are no longer capable of adapting to it. Therefore, the accumulated power erupts and mutates the body, adapting it to this amount of energy, and at the same time, transforming it so it can harbor even more power. This is the most basic concept of Evolution… or well, the evolution I am trying to refer to.
There's also the Evolution related to adaptability, living beings change and evolve to adapt to their environment and their circumstances, selective breeding can also cause specimens to "evolve" into something preferred by the one handling them. It could be said both concepts belong to the same word, Evolution.
