"No, the types of fish I give you are substitutes for species that have already been extinct in your history, so they won't cause species invasion." The system said.
"Then why not give us the species from before?" Xia Yue asked curiously.
"Not at all, the fish I gave you are from other worlds, they are just similar in habits and characteristics but not exactly the same." The system responded.
"Oh, I see." Xia Yue nodded.
"Do other worlds also have people like me who have a system like you?" Xia Yue asked curiously.
"Well, not all. Systems like mine are actually very hard to make. The resources used are very valuable. There are less than thirty thousand of me, but according to the known worlds of the Cosmic Alliance, there are over five hundred thousand, and countless unknown ones." The system explained.