In the underground chamber, Shinji had carried out extensive modifications on Ryūsetsuna and Chiyo, but the results still fell a little short.
Although the two of them were only half a step behind Haku and Yakumo and had now become outstanding kunoichi, that half-step gap was an insurmountable chasm between them and Six Paths level power.
Ryūsetsuna sensed something was wrong and asked with a ashamed look, "Lord, did we not do well enough?"
Shinji shook his head. "No. My earlier estimate was simply a little off."
Chiyo lowered her head. "I've let you down!"
"I wouldn't say that." After a pause, Shinji continued, "It was just an experiment. You don't need to take it to heart."
Ryūsetsuna thought for a moment, then asked, "Lord, besides guarding this place, do you have any other tasks for us?"
Chiyo chimed in, "Yes, yes! We can start storing up Chakra now. Just give us an assignment, and we'll do our best to complete it!"
"Store up Chakra?"
Shinji murmured.
Ryūsetsuna hurried to explain, "Yakumo told us that Lord Hokage knows a jutsu called the Yin Seal, which can store Chakra that isn't needed at the time. So Chiyo and I want to learn it and save up some Chakra in our spare time, to prepare for battle!"
Shinji smiled. "I've thought of a way!"
Ryūsetsuna and Chiyo were bewildered. They had no idea what Shinji had thought of.
Shinji didn't explain. He took Ryūsetsuna and Chiyo back to the Flying Fortress, then told them to go rest while he headed to the laboratory.
Ryūsetsuna's words had given Shinji an idea.
If modifying their environment alone couldn't boost Ryūsetsuna and Chiyo's combat strength to Six Paths level, he could use jutsu like the Yin Seal to grant them a massive increase in power