"What do you need?" Su Yu didn't agree immediately, but asked her what she wanted first.

Ning Shi: "I need the space bag, which is the item with space magic that Lord Su gave you when the merfolk were in action. ”

The ability of the space pack is a bit special, it can store things purely because of the system, but the people of this world automatically rationalize the function of the space pack to have space magic on it.

Su Yu thought for a while and said: "I won't hide it from you, there are many levels of space packs, the higher the level, the more things you can store, you used the second-level space pack when you were in the mermaid clan before, and the best in the current territory is the fourth-level space pack, the capacity of the fourth-level space pack is four times that of the second-level, but the number is very small, and it is impossible to sell it." ”

"If you're willing to help, I'm willing to sell you a Level 3 Space Pack for ten gold coins, the capacity of the Level 3 Space Pack is a bit worse than Level 4, but it's also twice as large as Level 2."

Ten gold coins is actually a lot, but for the space pack, which is a unique prop in the continent, ten gold coins is nothing at all, you must know that when the territory was not developed, a first-level space bag was auctioned for the price of thirty-seven gold coins.

Su Yu actually saw that Ning Shi had helped the territory a lot, and she wanted to win over, so she only sold it half and gave it away.

Ning Shi naturally understood what Su Yu meant.

If it had been before, she would definitely not agree to this kind of bargaining nature, she would rather buy it at the original price than owe favors.

After all, the value gap between helping to study the plague and space packs is too great.

But the Sunset Territory is different, or rather, the Su Lord is different.

Although she is not a person from the territory, she has already had a lot to do with the territory, she has helped the sunset territory a lot, and she has also gained a lot of benefits from it, in this case, it would be a bit hypocritical if she was too clear.

"Okay, then thank you Lord Su." Ning Shi readily agreed.

Since he agreed, and this matter was urgent, Ning Shi raised his feet and prepared to go to the hospital to find Vivian.

Before leaving, Su Yu suddenly thought of something, took out a space stone and showed it to Ning Shi, and then said: "Although the fourth-level space pack can't be sold to you, the space pack can be upgraded, if you can get the materials, I can ask someone to help you upgrade for free." ”

Other materials are easy to say, the territory is not lacking at all, and even in order to upgrade the space package, Su Yu has specially collected relevant materials.

But only the space stones are really rare, so far, although some have been obtained through various means, there are only thirteen space stones in the territory warehouse.

Compared to before, thirteen space stones are still a lot, but since the research of the Huicheng stone, the space stone is not enough.

There are so many stones in total, she can't wait to break them into ten pieces, if Ning Shi joins the territory, Su Yu will definitely be willing to give the fourth-level space package, and even willing to give it for free.

With her strength, after Dolly upgrades the space pack in the future, Su Yu will also give a new one, but after all, she is not a person from the territory, so there is no way.

Ning Shi looked at the one in Su Yu's hand over and over again, and was stunned to see any difference between it and ordinary stones, but she also knew that Su Yu didn't need to lie to her, so she secretly remembered the appearance of the space stone in her heart, said hello to Su Yu and went to the medical hall.

After the matter on Vivian's side was settled, Su Yu took the two gold devouring rats she had gotten back from Vivien to the black prison.

Although Vivien needs to use the Gold Eater Rats for drug experiments, Su Yu also needs the Gold Eater Rats as experiments to understand their properties, so she takes back two of them from Vivian.

Staring at the rats in two cages, Su Yu stared for a moment before launching her experiment.

Experimenting with the gold-eating rat's preferences for a variety of different foods, she came up with a variety of different materials such as fruits, vegetables, meat, metal, wood, and herbs.

After doing more than a dozen comparative experiments, Su Yu found a strange place, that is, the results of each experiment seemed to be different.

In the first experiment, both gold-eating rats chose to eat metal as soon as possible, and after eating metal, they ate wood.

In the second experiment, the two gold-eating rats went to eat meat for the first time, and after eating the meat, they ate metal.

In the third experiment, one gold-eating rat ate meat first, and the other went to eat wood, and when they were all done, they both chose metal.

……

After more than a dozen experiments, the results were like permutations and combinations, and there were almost no complete consistency, which made Su Yu unable to find any rules at all.

The only thing she could find was that the gold eater seemed to be omnivorous, and it wasn't an ordinary miscellaneous, and they could eat whatever they could and couldn't eat.

If I had to say that I had any preferences, it would be that I liked metal, followed by wood, and these two things seemed to be the first two choices for them, especially metal.

Su Yu locked the two gold eaters back up, then stared at the metal and wood for a moment.

Then, without knowing what she had in mind, she tried the distance again.

She placed the metal and wood that the Gold Eater had obvious preferences in a corner, and the cage in which the Gold Eater was held was placed in the diagonal corner, and the other food was placed next to the cage.

When metal and wood are the furthest apart, will the gold eater still choose them?

After several experiments in a row, Su Yu found that when distance was used as a variable, the results of the experiment were still chaotic.

The two gold-devouring rats seemed to be deliberately making trouble, not wanting her to discover the pattern, sometimes eating things from the edge of the nest, and sometimes running all the way to the diagonal to eat.

"What are the variables besides food type and distance?" Su Yu thought as he put all the gold devouring rats in a cage.

She wasn't going to continue the experiment for the time being, because she had just experimented too many times, so that the gold devouring rats that could eat it were all round and looked like they were dying, if it weren't for the small amount of food Su Yu gave each time, they would probably not be able to stand so many experiments at all.

Well, wait!

Heft?

Su Yu's eyes lit up, and then he carried two gold-devouring rats with round bellies to the medical hall.

A few minutes later, she left the infirmary with two 'emaciated' gold-eating rats.

That's right, in order to continue the experiment, Su Yu took two gold-devouring rats from Vivian who had not eaten, and the two that ate were left in the medical hall for Vivian to experiment.

After all, the rations are all fed, so it's not too much to let them dedicate themselves to being guinea pigs, right?

I don't know too much, anyway, Su Yu is very satisfied with the results of the third experiment.

In the first two experiments, the variables were the type of food and the distance, and in the absence of a clear answer, Su Yu believes that these two are not the characteristics that can clearly affect the gold-eating rat.