After his Enlightenment Skills refreshed, Mokgetsu went to Mount Myoboku again to study Immortal Techniques.
As for Mokgetsu's arrival, Fukasaku was both happy and miserable.
Happy because there would be another delicious feast to eat, miserable because Mokgetsu's way of learning Immortal Techniques was very unique—he just loved listening to all kinds of theories and principles.
It was fine to lecture for a little while, but talking for a whole day was truly exhausting, a kind of mental exhaustion, and this kind of fatigue was even more draining than physical tiredness.
The key was that Mokgetsu learned fast; some things he understood the moment you pointed them out, and the material Fukasaku Sage had prepared didn't even last for a whole day.
"Thank you very much." As he was leaving, Mokgetsu thanked Fukasaku Sage.
The more exhausted Fukasaku Sage was, the more Mokgetsu had improved.
Over these past two days, his Sage Mode proficiency had risen by five hundred points; at this pace, he should be able to raise Sage Mode to Master Level in about two months.
"It's nothing, come again when you have time." Fakasaku Sage said with a smile as he bid him farewell.
Although teaching was tiring, seeing Mokgetsu's understanding of Sage Mode gradually deepen, Fukasaku Sage still felt quite a sense of accomplishment.
"What an astonishing learning ability. If he keeps this up, I'm afraid in a few years his understanding of Immortal Techniques might catch up to mine." Fukasaku Sage sighed inwardly.
He had to admit that humans' learning ability was much stronger than that of them toads; the Immortal Techniques he had cultivated for several hundred years, Mokgetsu might be able to learn completely in just a few years.
Using Reverse Summoning Jutsu, he returned to Konoha again; Mokgetsu went back to his study at home and wrote down and organized the gains he had made today.
Although his memory was very good now, Mokgetsu still had the habit of writing on paper; he felt it made development easier.
After finishing recording his gains, Mokgetsu flipped to a brand new page and wrote a few big characters on the blank sheet: "Breathing Style Sage Art".
As Mokgetsu's understanding of Sage Mode deepened, he increasingly felt that the Mount Myoboku Sage Mode he currently grasped wasn't very suitable to teach to his disciples.
First was the old, oft-mentioned problem of duration; even if the Mount Myoboku side acknowledged all his disciples, the only ones who could use Two-Life Jutsu were Fukasaku Sage and Shima Sage.
If all the disciples wanted to use Sage Mode in a chaotic large-scale battle, at most only two people could enjoy the "power bank".
Naruto's Shadow Clone refill method was comparatively troublesome and also prone to accidents.
Another very important point was that the learning threshold for Sage Mode was very high; aside from Nagato, who was on a different level entirely, even Obito, who had the highest Chakra Amount, was still a fair distance away from the minimum requirement for Sage Mode.
Even Obito was like this, so there was no need to mention the others; even if Kakashi cultivated for another ten years, his Chakra Amount still wouldn't reach the requirement.
Not counting the Chakra inside the Yang Seal, at present Kakashi's Chakra Amount among Mokgetsu's disciples was only higher than Nohara Rin's.
High threshold, troublesome to learn, dangers during the Cultivation process, and it might not even play that big a role in actual combat—Mokgetsu couldn't ignore so many drawbacks and just quietly wait for his disciples to meet the requirements before teaching them Mount Myoboku Sage Art.
"First I have to solve the problem of sensing and absorbing Natural Energy." Mokgetsu wrote down the first difficulty that needed to be solved.
Aside from the various flaws of Mount Myoboku Sage Art, an unexpected discovery related to Breathing Techniques during his Immortal Technique training was also why Mokgetsu started developing Immortal Techniques so quickly.
Even if he didn't make any changes to the current Breathing Technique, as long as the user of the Breathing Technique had the ability to sense Natural Energy, the Breathing Technique could still be enhanced.
For Mokgetsu's disciples, who had mastered Breathing Techniques, this was undoubtedly a great thing, equivalent to enjoying the dividends of a version update.
"I need to develop a method for Breathing Style Sage Art to sense Natural Energy."
The Secret Technique Mount Myoboku used to sense and absorb Natural Energy only worked for Mount Myoboku Sage Mode, and if you didn't have enough Chakra, using that Secret Technique would one hundred percent result in you being eroded by Natural Energy and turning into a stone toad.
...
At night, after dinner, Kakashi sat on the corridor outside the house, carefully examining the katana in his hand that gleamed with a cold, chilling light.
After Mokgetsu defeated Uchiha Madara, Kakashi collected the shattered pieces of the White Fang Short Blade and, together with the portion that hadn't broken, handed them over to a well-known Ninja Tool Forger.
He spent a huge sum to have the other party add Chakra Metal and other precious metals to reforge the broken White Fang Short Blade into a katana.
Forging another short blade had no practical meaning; a katana or Tachi suited him better now.
Kakashi slid the brand-new White Fang back into its sheath and walked toward the wooden training dummy in the courtyard.
Swish!
At the instant he approached the dummy, Kakashi drew the blade; a silver-white arc of light flashed, and the wooden dummy was cleaved in two.
Kakashi nodded in satisfaction. Although the new White Fang was still not as good as Enma, it felt much more comfortable to use than the previous White Fang Short Blade.
He decided that from now on, he'd use White Fang for opponents who weren't too strong, and switch to Enma when facing powerful enemies.
Enma was indeed strong, but using it consumed a lot; for dealing with an ordinary Jonin, pulling out Enma was really unnecessary.
Just as Kakashi was about to return to his room to do maintenance on his new blade, a familiar voice sounded from outside the yard.
"Kakashi, are you home or not?" Obito shouted.
"I'm not."
"I already saw you, and you're still saying you're not home!"
Obito glared at Kakashi in dissatisfaction, annoyed that he was being brushed off like this.
"Since you already saw me, why did you even bother asking?" Kakashi shot back.
"Isn't it because I'm polite?" Obito said with an awkward laugh.
If he didn't have a favor to ask, Obito really wouldn't have wanted to come.
He'd taken first place in the disciples' internal war; this naturally evil, detestable white-haired guy was definitely secretly jealous of his brilliance and wanted to set him up.