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"Boss, what exactly was that natural artificial Spirit Bone you brought out today?"
Back at the assigned courtyard, everyone immediately surrounded Li Rong, curiosity written all over their faces. "Is it the same as our Spirit Bones?"
"It's completely different," Li Rong replied. "I only borrowed the name for convenience. What you cultivate is spirit power, while what they use is Chakra. The two systems are fundamentally incompatible."
"If a Ninja were to absorb a Spirit Bone from the Douluo Continent, the conflicting energies would collide. At best, their meridians would collapse. At worst—" Li Rong paused, smiling faintly. "—they would explode on the spot."
"…That violent?" Dugu Yan twitched.
"Then what's the actual difference between Chakra and spirit power?" Ye Leng Leng asked, clearly intrigued.
Li Rong explained patiently.
"On a fundamental level, both are combinations of life energy and spiritual energy. The difference lies in their proportions and operational logic."
"Spirit power is extremely stable. It nourishes meridians, prolongs lifespan, and grows steadily with cultivation. Its drawback is that in the early stages, it's weak—so weak that its destructive power isn't even comparable to a heavy crossbow. It's also very difficult to alter its attributes."
"Chakra, on the other hand, is volatile but powerful. Even a Genin can already wield Five-Element Ninjutsu. However, Chakra can't be stored in the body long-term, and excessive extraction directly overdrafts one's life force."
"In short, one favors stability and growth, the other favors explosiveness and flexibility."
"Because their compositions differ," Li Rong continued, "some of your Spirit Abilities look like divine miracles to them—while the Ninjutsu they casually use seems absurdly powerful to you."
Dugu Yan still looked confused.
Li Rong chuckled and waved his hand.
A light screen unfolded in midair, displaying two detailed meridian diagrams.
On the left, blue Chakra surged like a raging river.
On the right, red spirit power flowed calmly, like a deep current.
"Look here." Li Rong pointed. "When Chakra is extracted, this meridian bears enormous impact."
He then gestured to the other diagram. "Now, if a Spirit Master forces spirit power of the same level through that pathway—"
The red energy moved.
The meridians cracked.
Then—boom.
The entire meridian model shattered violently, spirit power scattering in all directions.
"This," Li Rong said lightly, "is what would happen."
"But… spirit power is gentler than Chakra, isn't it?" Ye Leng Leng frowned.
"It doesn't matter." Li Rong switched the demonstration. Chakra attempted to mimic spirit power's circulation route.
Halfway through—another explosion.
"Imitation goes both ways. The result is the same."
Bi Ji studied the diagrams carefully, then asked, "So… the human body structures of the two Worlds are different?"
"Exactly."
Li Rong raised his hand again, projecting two physiological models.
Left: Ninja World humans.
Right: Douluo Continent humans.
"They look almost identical on the surface," Li Rong said, overlaying precise data. "But fundamentally, they're worlds apart."
[Average Ninja World Human]
Cells: ~130 trillion
Meridian width: 0.5–1.0 mm
Life energy density: 2.8
[Average Douluo Human]
Cells: ~60 trillion
Meridian width: 0.3–0.7 mm
Life energy density: 1.0
"…So Ninja World humans are naturally stronger?" someone murmured.
"Physically, yes—but don't misunderstand," Li Rong corrected. "Spirit Masters absorb spirit rings."
The realization struck instantly.
Spirit rings provide exponential enhancement. Low initial values don't mean low ceilings.
"This is only the baseline difference," Li Rong continued. "To adapt to their respective energy systems, your meridians are also structured differently. Some meridians are even unique to individuals."
Dugu Yan frowned. "Does that mean we can't learn Ninjutsu at all?"
"Correct. Different bodies, different systems. Ninjutsu is incompatible."
"Many Ninjutsu can only be mastered by specific bloodlines," Li Rong added. "Not just because they're difficult, but because the techniques require special physiques."
He gave an example.
"The Hōzuki Clan of the Hidden Mist cultivates the Water Transformation Technique. Over generations, their bodies adapted to the technique—and the technique was refined to match their bodies."
"Now, even if outsiders know the method, they cannot learn it."
"This is what the Ninja World calls a Bloodline Limit."
"But then how does that artificial Spirit Bone allow Bloodline Limit Ninjutsu?" Ye Leng Leng asked. "Isn't it just energy?"
"The Spirit Bone doesn't change the body," Li Rong explained. "It contains engraved formations. The Ninja isn't mastering the technique—only activating it."
"The advantage is high power from the start. The drawback is simple."
"It can't be inherited."
Ning Rongrong frowned. "Then why can we learn cultivation methods from the shop if bodies differ between Worlds?"
Li Rong smiled.
"Why do you think the shop gives you modified cultivation methods?"
"…What?" Everyone froze.
"The original versions were created by humans of other Worlds, for their own physiques," Li Rong said calmly. "They were never suitable for you."
He continued, "Besides spirit power and Chakra, other Worlds cultivate internal force, blood qi, true qi, psionic power, and more."
"Every World has its own logic."
"And every logic produces a different kind of battle."
Everyone felt their blood stir.
"To walk through Worlds like this… to truly see how vast existence is—" someone murmured.
"Then grow stronger," Li Rong said, his tone gentle but firm. "Douluo is the first World I arrived in. It's special to me."
"If you keep progressing," he added with a faint smile, "I don't mind taking you across the myriad Heavens."
"We won't disappoint you!"
The courtyard erupted with excitement and resolve.
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