The Parasitic Beast actually has no relation to beasts, as it originally has no physical form. It is formed by a Mystic Doctor extracting the spirit of various distinctive animals.
Compared to humans, the spirit of animals is extremely thin, with some even lacking all three components. Extracting enough spirit to condense into an independent consciousness takes a long time.
In the process, some unique animals that match one's mentality need to be found, like cats, which are keen and agile.
For example, dogs are more loyal compared to other animals.
Some people even risk their lives seeking for wolf packs, intent on extracting the spirit of the pack, as wolves have great teamwork abilities.
All these require preliminary preparation, and the thousands of herbs needed can be temporarily ignored, as finding them is much simpler than extracting these spirits.
However, the failure rate during condensation is over eighty percent!
