Take the Float-Float Fruit and the Gravity-Gravity Fruit as examples.
Both Devil Fruits possess the power to manipulate gravity, capable of lifting landmasses and creating floating islands. On the surface, their effects appear similar—but in practice, the difference between them is vast.
The Float-Float Fruit requires only a minimal expenditure of energy to lift an island. Once the target is set afloat, it remains suspended without the need for continuous output. Stability is effortless, as though the island itself has accepted flight as its natural state.
The Gravity-Gravity Fruit, by contrast, demands constant power to maintain the same result. Its strength lies not in finesse, but in overwhelming force. It was never designed for delicate manipulation—it exists purely for destruction.
In front of the Gravity-Gravity Fruit, the Float-Float Fruit has no room to display its advantages. Any attempt at subtle control is crushed outright by raw gravitational dominance.
It was precisely this disparity that inspired Xiao's idea.
By fusing higher-tier and lower-tier Devil Fruits, he aimed to compensate for their respective flaws—bridging gaps in efficiency, stability, and combat application—to elevate the overall strength of the resulting ability.
To Xiao, a complete Law resembled a towering tree.
The trunk represented the core principle. From it grew countless conceptual branches, each embodying a different expression of that Law. A Devil Fruit, at its core, merely grasped a single branch and shaped its ability around it.
What Xiao sought to do was reverse that process.
He intended to reintegrate the branches back into the trunk—reconstructing a more complete Law—thereby forging a more versatile and perfected Super Devil Fruit.
Such a creation would not only preserve the strengths of each individual Fruit, but also eliminate the combat bottlenecks imposed by overly specialized abilities.
If successful, Xiao's power would undergo another qualitative leap—one that could significantly increase his odds in the brutal competition of the Da Luo Arena.
With the Cyber Dimension's immense computational capacity, Xiao rapidly verified the theoretical feasibility of Devil Fruit fusion and began allocating resources for deeper analysis.
Fusion Proposal Evaluation:
The concept is logically sound and supported by theoretical modeling.
Estimated baseline success probability: 30%.
Current status: database construction in progress.
Insufficient comparative data detected. Supplementary analysis required.
Moments later, the Cyber Dimension completed its preliminary simulations and presented four viable fusion frameworks:
Law Carrier: Zoan-type · Mythical Beast
Core Law: Logia-type
Branch Laws: Paramecia-type
Estimated Success Rate: 52%Law Carrier: Logia-type
Core Law: Zoan-type
Branch Laws: Paramecia-type
Estimated Success Rate: 54%Law Carrier: Paramecia-type
Core Law: Paramecia-type
Branch Laws: Paramecia-type
Estimated Success Rate: 67%Law Carrier: Zoan-type
Core Law: Zoan-type
Branch Laws: Zoan-type
Estimated Success Rate: 96%
The Cyber Dimension made no attempt to hide the trade-off.
As success probability increased, overall potential declined.
Pure Zoan fusion was nearly foolproof—but its ceiling was painfully low. Even multiple standard Zoan Fruits combined could never rival a Mythical Beast Fruit, each of which possessed unique supernatural authority.
If Xiao was going to choose, he would choose the strongest option available.
He selected the Munch-Munch Fruit, awakened into the God of All Machines form, as the fusion core—integrating it with the Dark-Dark Fruit as the primary Law, followed by multiple Paramecia branches.
The success rate was low.
But the payoff was unparalleled.
Failure carried no real risk. With an entire world stored within his dimensional space, Xiao could afford to experiment freely—even self-destruction posed no lasting consequence.
More importantly, there existed a subtle yet profound connection between the Munch-Munch Fruit and the Dark-Dark Fruit.
In the world of One Piece, every Logia Fruit corresponds to a natural phenomenon. Light. Magma. Ice.
The Dark-Dark Fruit, despite its name, was an anomaly.
Its abilities had nothing to do with darkness as an element.
Every manifestation—attraction, compression, annihilation—pointed to a single underlying principle:
Gravity.
More specifically—
A black hole.
The reason it was labeled "dark" was simple: black holes devour light, leaving only absolute blackness behind.
In Xiao's view, this misclassification stemmed from ignorance. The pirate world lacked the knowledge to understand black holes, so they mistook the absence of light for the presence of darkness.
They saw black—and stopped thinking.
The Dark-Dark Fruit possessed only the surface characteristics of a black hole.
It could swallow—but it could not digest.
Everything it absorbed was eventually expelled.
The Munch-Munch Fruit, however, filled that exact void.
It did not merely consume—it processed. It converted matter into energy, transforming intake into permanent growth.
Used as a core, the Munch-Munch Fruit could complete the Dark-Dark Fruit's missing half.
Swallowing.
Digestion.
Assimilation.
Together, they could form a true black hole authority.
As for integrating Paramecia Laws afterward—Xiao had yet to finalize that stage. But if the Dark-Dark Fruit truly represented a black hole, then his goal was clear:
He would forge a real black hole Devil Fruit.
Of course, Devil Fruit fusion was no simple act.
Consuming multiple Fruits directly was impossible. Xiao was not a natural multi-fruit user like Blackbeard.
Fusion required precise formulae, probability control, and enormous volumes of experimental data.
Most critical of all was the medium.
Xiao planned to create a special seed—infused with a fragment of Law—which would mature into a stable fusion vessel. Only through such an intermediary could two incompatible powers be gradually merged.
As his thoughts aligned, inspiration surged like a flood.
A faint, knowing smile curved across Xiao's lips.
With a single thought, he opened the dimensional vault and retrieved the long-sealed Munch-Munch Fruit.
In his left hand lay the Dark-Dark Fruit.
In his right, the Swallow-Swallow Fruit.
Two overwhelming forces pulsed beneath his fingertips.
The dimensional space trembled.
And as the hidden mechanisms activated, the power of both Devil Fruits began to flow—slowly, inexorably—toward convergence.
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