Bai Qingqian had found forty-three Thunder Attribute Artifacts for him, which was a significant amount. If these had been common artifacts of the Five Elements, the number wouldn't be anything special, but Thunder Attribute Artifacts were rare and precious. The fact that she could collect so many showed how much effort Bai's Trading Company had put into this.
She had nearly invested the entire trading company into this endeavor. This was a favor he couldn't avoid.
Out of the forty-three Thunder System Magical Artifacts, he selected fifteen; his method of selection was quite peculiar. He didn't choose based on monetary value but on the mechanism of operation—picking one of each type that operated the thunder in a similar way.
What he wanted to learn was the method of manipulating thunder, not to truly use these artifacts in combat.