Mystic Sumatra Art—Billakin Shrink!
It was the most efficient usage of a Billakin's properties to mould the body. Extreme effort to put into the imprint characteristics to ensure the Brully whose body was being changed didn't die from the extreme stress or have their Spirit Container shatter.
Mystic Sumatra Art—Brully Human Blueprint!
It was a Skill that allowed a Brully to map out what their human form would look like. And they would they use the Skill of Billakin Shrink to eventually get to the body shown through the blueprint.
The Brully Human Blueprint allowed a Brully to look no different from a Free Human. And of course, since they will have the method to obtain the three Natures of their Billakin, which would be granted into the Billakin part of their hearts, they could easily go around to act as a Free Human, including the usage of a Human Avatar.
