The development of Mustard Seed Storage went more smoothly than Feng Lingtian had anticipated, but it was also more complex than he had expected.
He rummaged through the Pill Pavilion's warehouse and found several pieces of dense ore, and also asked Dugu Bo herb garden.
The spring water itself has a slight preservation effect, although not as strong as the Ice and Fire Yin Yang Well, it is sufficient for experiments.
Feng Lingtian tested it in the side hall for three days. On the first day, the ore shattered five times, but exploded immediately after Soul Power was injected.
The next day, he used spiritual spring water to adjust the texture of the ore so that it could contain Soul Power without breaking, but the space was too small, not even enough to fit a Sausage.
On the third day, he made adjustments to the patterns, expanding the space by a circle, but the things placed inside would still slowly deteriorate—the space was there, but the power to stop time was lacking.
Feng Lingtian sat at his desk for a while, then got up and went to find Shi Yan.
Shi Yan was sitting by the martial arts arena. After hearing Feng Lingtian's purpose, he didn't ask any questions, but simply stretched out his hand with his palm facing up.
After his Soul Power condensed for a moment, a wisp of extremely faint silver-gray light was peeled off from his fingertip and floated in mid-air, like a piece of thread that had been pulled out.
"Is that enough?" Shi Yan asked.
"That's enough." Feng Lingtian carefully guided the wisp of silver-gray light into the patterns of the Mustard Seed Storage. The light followed the patterns and slowly merged into the interior of the mineral, as if it were being absorbed.
Feng Lingtian held the Mustard Seed Storage in his hand and felt it. The sense of space inside was much more stable than before, as if there was an invisible barrier.
He put a freshly baked hot pastry inside and closed the Mustard Seed Storage.
The next morning, he took it out and saw that the pastry was still warm, almost exactly the same as when he put it in. The heat inside hadn't dissipated, indicating that the time flow inside the Mustard Seed Storage was different from the outside.
He closed his eyes to confirm his Soul Power perception; everything in the space was stable and normal.
It's done.
Feng Lingtian opened his eyes, ate the pastry, confirmed that there was no problem, and then got up and left the side hall.
He went to see Oscar first.
Oscar was sitting in the courtyard where Ning Rongrong lived, holding a cup of tea but not drinking it, as if he was thinking about something.
Feng Lingtian walked over and sat down next to him. Without exchanging pleasantries, he said directly, " The Storage Soul Tool has been developed."
Oscar turned his head. "So fast?"
"Try it and see if you can put it in your Sausage." Feng Lingtian handed over the Mustard Seed Storage Ring.
Oscar took it and looked at it for a while, then put the ring on his hand and tested the Soul Power injection. He then condensed a Mirror Sausage and put it in.
After an incense stick's time, when it was taken out again, the Mirror Sausage still had a full luster, without any diminishment.
"It works," Oscar said, a hint of surprise in his voice. "Can you make these in batches?"
Feng Lingtian nodded. "It can be made, but the materials are limited. Let's give it to those who need to go out for training first."
Oscar paused for a moment, then conjured several Mirror Sausage and handed them over. "Here, take them all. Pack them up."
Feng Lingtian took it and glanced at it. "How much?"
"It's free," Oscar said. "You didn't charge me when you gave me directions before either."
Feng Lingtian didn't refuse, and put the Mirror Sausage into his Mustard Seed Storage Ring: "Thanks. Consider this Mustard Seed Storage a gift for you."
Oscar glanced down at the ring on his hand and didn't refuse. "Then I won't be polite."
After returning to the academy, Feng Lingtian gathered everyone at the edge of the training ground.
"I've successfully crafted the Storage Soul Tool," he said. "However, materials are limited. Let me first confirm if anyone plans to go out for training."
Bai Yu was the first to raise her hand. "I plan to go home and visit."
Shi Yan stood next to her and raised his hand, "I'll go with Xiaoyu."
Su Ran also raised her hand. " Qingyu and I are planning to go for a walk."
Jiang Lin thought for a moment, then raised his hand. " Bai Lingyu and I are also planning to go out for a bit."
Feng Xiaotian stood at the back of the crowd, not raising his hand, but said, " Bing'er and I are going out too."
Feng Lingtian glanced around. "Five teams in total. Bai Yu and Shi Yan are in one team, Su Ran and Ye Qingyu are in another, Jiang Lin and Bai Lingyu are in another, and I'm in a team with Shui Bing'er —I'll be in my own team. We'll leave the other people's Storage Soul Tool for now, and we'll get them later if needed."
That evening, Feng Lingtian handed the five Mustard Seed Storage Ring to each team. "Wear them on your wrists, and you can open them by injecting Soul Power. The Mirror Sausage has already been placed inside; just take it out when needed."
Bai Yu took the ring and twirled it in her hand. "This thing is quite pretty."
Su Ran took it but didn't put it on immediately. Instead, she looked at it several times before solemnly putting it on. "It's really nice."
Feng Xiaotian took the ring without asking any questions and put it on his hand.
Everyone carefully put away their rings without saying much, but they all knew in their hearts that starting the next day, they would no longer be people they could see every day at the academy.
When Feng Lingtian returned to his residence, the lanterns along the corridor were already lit. He opened and closed " Lingtian's Notes," thought for a moment, and then didn't write anything on it.
Starting tomorrow, we'll go our separate ways.