It was obvious that the intelligence of the three hosts, not their strength, affected the quality of the Brain Eater.
After a long period of human experiments, the crazy scientists had come up with the best plan to breed the Blue Jade Butterfly.
The first host of the Brain Eater was preferably a five-or six-year-old child whose brain was in its final golden stage of development.
The second host would choose a youth between the ages of 13 and 15.
The third host would choose a youth between the ages of 20 and 26 whose brain had reached its peak.
After the age of 26 or 27, the human brain began to gradually decline, making it unsuitable to become the host of the Brain Eater.
After the results of this research were released, the world was in an uproar.
Many countries in the world directly issued bans, banning any organization or individual from using humans to nurture the Blue Jade Butterfly larvae.