Dan stood in the middle of a vast gray expanse whose limits and end could not be seen, a strange and disorienting space where there was no sense of up or down, left or right. Everywhere around him stretched a uniform gray void without distinction or feature. He floated within it without any clear point of reference, his eyes carefully examining the immense space he had just opened while he precisely calculated its approximate dimensions and the stability of its spacetime structure.
"I think this size is perfectly suitable."
Dan muttered to himself, his voice spreading strangely through the silent gray void as though the place itself absorbed the sound. He was satisfied with the initial result, even though the real work had not yet begun. This was merely the first step of a massive long-term project that would take years, perhaps even decades, to complete in the exact form he envisioned in his mind.
In truth, the project he was working on now was one of the most important undertakings he had ever planned, something that would greatly increase the safety and protection of his ever-growing family. It was not a new idea that had suddenly come to him recently, but rather an old ambition dating back to the beginning of his deep exploration into the field of space and time many years ago. Since then, Dan had wanted to create a massive, stable, and completely secure inner world where he could relocate his entire family. This world would become the true homeland of the Walt family, greatly increasing their protection while allowing them to remain even more deeply hidden from the outside world.
Of course, this did not mean abandoning their current headquarters in the Sacred Dragon Forest, where they had built their hidden miniature civilization over decades of work. Rather, in the future, their current base would simply become the main gateway and entrance to the Inner World, which would serve as the family's true and perfectly secure home. The outer headquarters would still exist and continue functioning as a façade and a point of contact with the outside world, but their real lives, the important ones, would unfold inside this completely hidden world protected beneath layers of spacetime itself.
Dan knew with certainty from his previous knowledge that this world already contained enormous inner dimensions resembling complete worlds rather than mere small pockets of space. There were truly massive dimensions, genuine inner realms like the ones he had seen in the original story back in his old world before coming here. This had been especially clear during the final battle against Kaguya, when Naruto and Sasuke had been dragged through multiple separate dimensions during the fight, moving from a world of molten lava to a world of ice and countless other environments.
Because of that, Dan had carried this ambitious idea ever since he first seriously connected with the field of space and time and began understanding its deeper secrets and mastering its manipulation. Yet theoretical understanding alone had never been enough. Practical application required a far greater level of power and control over spacetime itself. But now, after his abilities had evolved tremendously and after mastering the Fifth Level of the Space-Time Seal, reaching a stage where he could manipulate space itself on a large scale, he had finally become capable of beginning this enormous and ambitious project he had always desired.
And after tremendous effort and countless attempts, he had finally succeeded in opening this gigantic inner pocket dimension, a separate internal space disconnected from the outside world except through a single gate completely under Dan's control.
The space he created was enormous, stretching for thousands of kilometers in every direction, large enough to build several cities in the future if he wished and more than sufficient to house his ever-growing family for countless generations to come.
Yet despite this achievement, the new Inner World still required an immense amount of careful work before it could truly become habitable and ready for practical use. Right now, it remained in an extremely primitive state. Most importantly, it was still nothing more than an empty gray void incapable of supporting life in any form. There was no breathable air, no water to drink, no soil for agriculture, no stable gravity, not even a source of light or heat.
All that existed for now was a dull gray emptiness, stable from a spacetime perspective but completely devoid of every fundamental requirement for life. He would need to create an entire ecosystem from scratch, build an atmosphere with the correct balance of oxygen and nitrogen, establish a clean water source and a complete water cycle with rain, rivers, and lakes. He would need to bring fertile soil or create it himself, cultivate plants and trees to form a sustainable ecosystem, and regulate gravity so that it would be comfortable and suitable for human life.
All of this would require an enormous amount of time, effort, and resources, but Dan was completely prepared for it. In fact, he was excited. He had already carefully planned the next stages in detail. First, he would establish a stable gravitational system using complex seals distributed throughout the entire dimension to generate artificial gravity similar to the natural gravity suitable for humans. The next step would be light, a sun, and control over the cycle of day and night. His plan for that was to reflect sunlight from the outside world. So although the inner dimension possessed considerable independence, it was not entirely separated from reality. He also intended to synchronize it with the planet itself so that it would move alongside it in the same orbital path. That would preserve the same day-and-night cycle as the outside world, ensuring ecological stability within the Inner World.
But before any of that, there were still other necessary steps he had to complete first.
He would need raw material to build this world.
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