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I had chosen the Gorgon evolution and it was filling me with power. A cocoon of purple mist suddenly encompassed my entire body, filling it with this mysterious energy.
The very core of my soul started to absorb this energy and assimilate it, turning it into my own power, I began to evolve rather quickly.
As a Ghost, I don't have a physical body that can evolve, therefore what evolves is my own soul, each time I evolve my very soul grow stronger through mutations. Although there is also what I call the Phantom, an outer layer that progressively grows thicker and stronger the more a Ghost grows stronger by leveling up.
This Phantom also evolves, but the Soul is also impacted by the evolution, making the core of my phantom, the soul, which one would call "the creamy filling" of a ghost, began to mutate and transform with my new evolution.