As a part of training for Jason and others, Elder Boron took them to some smaller demon and devil worlds to destroy.
Of course, the part where removing the world core from the core realm of the worlds was left to Elder Boron as he was the only one who could retrieve them.
"Oh. No wonder, the system is giving me more and more smaller world cores recently."
Ajax thought about the time when he received back to back world cores from the system; however, they were all smaller world cores, so he didn't make much progress in his cultivation.
Nevertheless, he was grateful to Elder Boron, Jason and others for helping him even when they were not with him.
"As for your other question 'Who created the artifact?' is, I don't know."
Elder Boron didn't waste any time as he answered Ajax's earlier question as he continued, "However, I am sure about one thing though."
"Huh?"