"All right, Tsunade, it's time for you to return to Konoha. But you can't go back just like this—especially not the matter of meeting me. You must not tell anyone about it," Lu Xuan told Tsunade sternly.
Young Tsunade raised her little head and nodded like a pecking chick.
Seeing her expression, Lu Xuan nodded. "In that case, Mito, teach her the Spirit Strength Technique you recently developed. Consider it compensation."
Tsunade's eyes lit up. She had witnessed Lu Xuan's strength, so she was naturally full of anticipation for the ninjutsu he mentioned. Still, she forcibly restrained herself from appearing overly excited.
Not long afterward, Mito taught Tsunade the so-called Spirit Strength Technique. It was a ninjutsu that stored chakra during ordinary times, then unleashed tremendous power at critical moments.
Of course, because Mito had developed it herself, its effects were somewhat limited. It did not provide the effect of instantly healing wounds.
It was only later, after Tsunade entered Shikkotsu Forest, formed a contract with Katsuyu, and truly mastered medical ninjutsu, that she improved the Spirit Strength Technique according to her own circumstances and named it the Strength of a Hundred Technique!
Mastery of ninjutsu varied from person to person. As long as the hand seals and basic theory were taught, anyone with sufficient talent could naturally gain an initial grasp of it. Moreover, although the Spirit Strength Technique was not low-level, it happened to suit Tsunade exceptionally well.
In just over an hour, Tsunade had initially mastered the technique. When chakra flowed to her forehead and was stored there, a faint diamond-shaped mark appeared between her brows. It would be impossible to notice without close inspection.
"All right, time to go." Lu Xuan walked over and glanced at her forehead.
His black robe fluttered slightly, and space rippled