Purity was everything in what Noah was attempting to do.
In the stars, nuclear fusion could eventually start using heavier elements if the temperature and gravity allowed it. Yet, Noah needed to limit the materials to his darkness.
He was trying to create a procedure that would naturally bring his "Breath" to a higher state. There couldn't be any impurity in that.
The Black Hole spell floated in the darkness as his gravitational pull started affecting the energy in the underground room. "Breath" began to flow toward the small dark sphere, but it didn't enter in it. It only remained on its surface where it accumulated.
Noah had to modify his spell to make it fit the requirements of his procedure. The modification didn't take long because he only had to remove some of the abilities of the dark sphere, but he still had to spend months on it since it was a rank 5 spell.
However, he had obtained what he needed in the end.
That version of the Black Hole spell didn't increase in size nor absorbed energy in its form. Noah had left only its gravitational pull and eased its connection with his mind.
Also, he had made sure that the dark sphere would continue working even after he severed his connection with it. It wouldn't be stable without his direct control, but it wouldn't weigh on his mind either in that way.
That was just a precaution since the spell wouldn't grow stronger with time. It didn't absorb energy anymore, so its power was fixed somewhere near the limits of the gaseous stage.
Still, Noah felt that it was better to play it safe when dealing with dangerous experiments. He didn't know what would come out of that procedure, but he was sure that it could be fatal to neglect some details.
Noah released more of his darkness as the spell kept on attracting it. He couldn't leave any space in the underground area since he would risk attracting different types of "Breath".
The sphere needed to be pure, wholly made of his darkness. Letting impurities fuse with its form would be asking to destabilize it.
Layers of "Breath" gathered around the dark sphere. Noah's darkness condensed around it and flowed in a round motion as the gravitational pull kept it bound in that place.
Noah's eyes couldn't see it since the darkness in the air blocked the light radiated by the inscriptions on the walls. Yet, his mind could sense it.
The small sphere had already become a giant uneven orb that had a dense gas flowing around its center. However, it still failed to show the reaction that Noah wanted.
Noah didn't mind it. The fact that his "Breath" didn't cause any explosion showed how promising that procedure was already. His darkness would amass naturally around his spell and increase its density as more of it reached for the sphere.
'I wonder when it is going to have its gravitational pull,' Noah thought as he analyzed the energy amassed in front of him.
According to the physic that he had studied in his past life, gravity depended on the amount of mass accumulated in an area. Noah was trying to achieve that with his dense darkness, but he didn't know what level of density it had to reach before it could start making up for the limited features of his spell.
After all, Noah wasn't an expert in that field. He was trying to imitate what usually happened in the stars with his poor knowledge.
Noah kept on refilling the darkness in the underground area as the spell continued to gather it around its shape. The amount of energy accumulated there had already surpassed what he managed to withstand with his mind, but the weaker connection allowed him to maintain his control over it.
Its gravitational pull though still failed to arrive, and the procedure eventually reached the point where the power of the Black Hole spell couldn't attract energy anymore.
'This is the limit of an ability in the gaseous stage,' Noah thought as he stared at the massive accumulation of energy in front of him. He couldn't see it, but he faced it anyway since he was too focused on it.
'I have to loosen it up a bit,' Noah thought as he turned and opened his mouth. White ethereal flames came out of it and spread in the environment, affecting the structure of his darkness and softening its innate resistance to the gravitational pull.
Noah's flames used the energy stored in his body. The primary energy fueled them and turned them into an attack of the darkness element.
Using them directly on the sphere would affect its functioning and taint the material accumulated there. Still, the flames would only make Noah's darkness more ductile if he only targeted the spots away from his spell.
Also, the flames would disperse before the "Breath" reached for his spell, so he could use them quite freely if needed.
The temperature in the underground area rose as flames spread in the air and loosened the structure of Noah's "Breath". More darkness began to flow into the black sphere at that point, and the layers of energy around it resumed their accumulation.
Then, Noah felt a second traction force coming from the dense gases in front of him. The darkness attracted by his spell had finally reached the point where it could help in that procedure!
With two gravitational pulls together in one place, Noah didn't need to use his flames anymore. The "Breath" that kept on flowing inside that construct made the traction force become powerful enough to surpass the limits of the gaseous stage.
'It's about to become self-sufficient,' Noah exclaimed in his mind as he continued to pour "Breath" in the environment. He knew that it would come to a point where all his reserves of darkness would be gone, but he had to continue giving to the procedure only one material.
Everything would have been for nothing if he allowed some different form of energy into the spherical accumulation of his darkness.
The sphere's shape had become peculiar after its gravitational pull started. There would be some occasional flare as more energy condensed there, and its surface was continually rotating as if it was an actual star that was trying to come to life.
Eventually, Noah had to cut away his connection with the Black Hole spell because there was so much energy around it. That affected the link between Noah and his ability, even if it wasn't a direct connection.
The procedure though didn't stop. The spell still worked after losing its connection with Noah, and the gravitational pull of the darkness around it had already become self-sufficient.
Noah didn't need to do anything but to wait until the experiment required his flames again.
The hours passed in the underground area as Noah waited for a change to appear in his darkness. It was only a matter of time before a significant event happened.