Mirai slowly tapped his knee. This fellow had actually turned his own body into a dwelling place for the Nether Butterfly and sustained it with offerings. The world inhabited by summoned beasts differed from the present world—Mirai had felt that deeply at Mount Myoboku.
Mount Myoboku was filled with immensely powerful life force. With every breath, one could even sense the flow of chakra all around. Yet chakra in the present world had already become quite thin; the chakra available for use in the air was growing scarcer and scarcer. This was extremely uncomfortable for summoned beasts.
If they could not replenish chakra through breathing, they could only resort to other methods—absorbing human chakra. Aburame Fangxiu had kept this summoned beast living inside his body while continuously refining chakra to sustain it. Over time, that truly could allow the Nether Butterfly to survive within him.
Then, when he needed it, he could summon it out. Moreover, he could keep the summoned beast inside his body in larval form, reducing the burden on himself.
But the result was that such a summoned beast was disposable. The larva emerged from his body and transformed into a fully developed Nether Butterfly. Only a fully developed Nether Butterfly possessed scouting abilities, but in that state, it would inevitably be unable to return to his body. After that...
The Nether Butterfly would die. Yet there was a way to keep this cycle going.
Reproduction... Mirai stroked the scroll in his hand. Nether Butterflies were creatures that reproduced asexually. In fact, a large portion of Pluton's summoned beasts reproduced asexually. But rather than reproduction, it was more like fission. This Nether Butterfly had used its mouthparts to inject a portion of its soul into Aburame Fangxiu's body. That fragment would then hatch within Aburame Fangxiu's body