A huge, ethereal snake formed at the center of the formation, and it began to struggle as soon as it realized that it could move.
Invisible boundaries kept the Snake's will confined inside the lines of the formation, but they wouldn't hold for long if Noah let it act freely.
Thirty-seven had taken inspiration from the work with the living weapons to create that version of the Body-inscription spell. Still, he couldn't focus on the sturdiness of the formation since it had multiple features that were absent in the original ability.
After all, there was no Beast Core at that time. Noah would need to link that will with the body made of higher energy directly inside the formation if he wanted to meet the requirements necessary for the creation of a tattoo.
That was an essential procedure to create a connection between the Blood Companion and Noah's mind. Thirty-seven had to sacrifice the sturdiness of his formation to add those features.