Uchiha Yu and Miwa Masayo stayed at Cat Castle for seven days, keeping busy with many tasks.
Nine Ninja Cats received treatment. Seven of them mastered Sage Chakra, while the other two completely failed at Senjutsu cultivation but were freed from the troubles caused by Natural Energy.
Most importantly, using his own knowledge, Uchiha Yu mobilized over a thousand Ninja Cats to build a simple altar that could increase the concentration of Natural Energy to a certain extent.
Because he lacked knowledge of Sealing Jutsu, the altar was enormous—a massive funnel-shaped structure like the Colosseum—yet only a small area at the very bottom was effective.
With this altar, eight Cat Sages could cultivate at once under normal circumstances. It could also be used by other ninja beasts to practice Senjutsu, increasing their chances of sensing Natural Energy.
Miwa Masayo felt it out atop the altar for a while, then said unhappily, "The concentration of Natural Energy is still terrible, meow. Would improving it with Sealing Jutsu make it more effective, meow?"
Uchiha Yu shook his head. "There's no way to make it stronger. I didn't build the altar this huge because I like big structures. The concentration-enhancing effect has already reached its limit. Improvements through Sealing Jutsu could only reduce the altar's footprint."
"In the end, Cat Castle's environment just isn't good enough. I think we'll still have to consider relocating in the future. There must be places in the Ninja World with a high concentration of Natural Energy."
Maoyu nodded in agreement. "Lord Yu is right. The valley occupied by the Giant Insect Clan is excellent, but Cat Castle doesn't yet have the strength to claim such a good place."
"Exactly. A treasure land has no owner; the virtuous and strong may dwell there. Maoyu, Cat Castle still has