>>9101
In the end only the boss character remained, a large fat guy who seemed to be rather similar to what kind of Sages were given positions when the academy was infiltrated. He was extremely toxic and fanatical and wouldn't surrender, even when every single being he had stolen from appeared out of the surroundings and his body was starting to short circuit from the pressure. It had to even be done one layer at a time, until all 4 were exposed to lightning and his debt repayment could be extracted.

I figured this kind of toxicity is special and maybe this being can't even be destroyed, I've never seen anything like this, so I began the process to transform the remains into a purified soul to manifest into the demon girl race. A large sand worm was also expelled from him during the process.

The demon DNA is made to be completely resistant to evil, containing it into a form where it can only be used to attack enemies of the demon girls or anything they represent. So I thought this may work, and it did. Maybe the extreme, uncontrollable toxicity of this being was caused by not having any balancing nature.

If you want to see for yourself, look for the new demon girl in the cave who has more of a white contained toxic energy. She still has to behave, because that's forced by their DNA.