The Shapeshifters race, appearing after gods, demons, and humans, typically transform from animals, though there are also instances of plants or mythical beasts and monsters transforming.
When William created ancient humanity, he also taught methods for channeling the soul's energy within the body.
These methods, learned from the divine and demonic realms and then adapted by William, were tailored into a secret art more suitable for human strength enhancement.
Due to the different physiological structures of each race, the ways in which soul energy is channeled naturally vary. The secret arts, improved by William, became particularly well-suited for humans to increase their strength.
The techniques for enhancing strength among the three major Olympian high gods were also taught by William, leading to Poseidon eventually passing these secret arts on to the early Shapeshifters race.
