In the simplest way possible, Yayoi had obtained a sample of Natural Energy.
Next, he repeated the trick, drawing all the blood he would normally have let out that day.
He let Little Slug soak in it to capture the Natural Energy.
Little Slug was too large for the blood to cover his body, and Yayoi did not have enough blood to add more.
With no other choice, Little Slug absorbed some of it and let the rest disperse.
Yayoi released the summoning. With a poof and a cloud of white smoke, Little Slug returned to Shikkotsu Forest.
Yayoi swirled the stoppered test tube in his hand.
The vivid green liquid inside looked like life itself, almost mesmerizing him.
Given the properties of Natural Energy, perhaps he could forge it into a weapon.
All he needed was a simple mechanism to seal Natural Energy inside a weapon, carve a blood groove into it, and release the energy during battle.
Could he use it as an instantly lethal poison in combat?
After thinking it over, Yayoi decided it could work.
If someone had mastered Immortal Mode, that little bit of energy would barely register.
But if they had not mastered Senjutsu, they would lose control at once.
It would be indispensable on the battlefield. The only problem was that producing it took too much technical skill.
Equipping an entire battlefield with it would be like using a cannon to kill mosquitoes.
Yayoi decided to make a few extra for his own people.
Even a Jonin would be helpless once the Natural Energy ran wild. At the very least, they would lose the ability to fight.
In that window of time, even a Genin could kill a Jonin.
The principle was simple. It relied entirely on Natural Energy's tendency to run out