This is the first time he has really eaten enough in this world, not to mention how beautiful it feels.

After a short break, he got up and continued rummaging through the contents of the room, and soon he found the valuable things in the room.

A pile of messy-looking manuscript paper, three worn-out notebooks, and a few sealed potions found in a wooden box under the bed, the exact effect of which is unknown for the time being.

He first looked through the notes, but fortunately the words used in the notes were the words he knew, a relatively remote rune language, the structure was actually very similar to English, except that there were more words, and when expressing in sentences, they were more inclined to Chinese, probably like Chinese English.

Through the first notebook, Zhang Sen finally knew the identity of the vulture old man.

The poor fellow's name was Hemerway, a native of the kingdom of Sauklu, a doctor by profession, and later came into contact with the mysterious profession of a pharmacist, so he became completely obsessed with the mysterious knowledge of a pharmacist.

Because of his family's incomprehension, and because there were many experiments in the kingdom that could not be carried out, he sailed out to sea alone, found the unmarked island, and studied the knowledge of the food apothecary in seclusion.

Dietetic is probably the extraordinary profession of this world.

The biggest feature of this profession is to change the human body, slowly transferring the abilities of some special creatures to the human body through diet and medicine, so that human beings can essentially evolve.

When Hemmaway was a doctor, he made a bet with a wealthy businessman and finally met a dietetic who could be reborn with a severed limb, so he was shocked and curious about everything about the dieter, and he plunged into the world of the dieter.

His research subject was shadow fleas.

In fact, he raised all the shadow fleas on the island, and his goal was to find the right diet and medicine so that the human body could have the ability of shadow fleas.

In fact, his research has been 90% successful, he has studied the human body to absorb the ability of the shadow flea, the problem is that the weakness of the shadow flea will also be absorbed, that is, you can't see the sun, otherwise you will die because the body is too hot, he is currently overcoming this problem, as long as the weakness is eliminated, then he can get the ability of the shadow flea, perfect stealth in the shadows.

After reading the three notebooks, Zhang Sen found that he seemed to have killed an ordinary old man who was technically only a little fanatical about the occult.

In fact, the shadow flea is not dangerous, because the shadow flea is very afraid of fire, and even in some places with fire, the shadow flea will instinctively dare not approach, so it only needs to grill a part of the place with fire, and the shadow flea will naturally not approach when it feels the fire, and Hemerway's residence is used to prevent the shadow flea from entering.

Zhang Sen's next step was to look through the manuscript papers, the contents of which were very messy and scattered, but Zhang Sen looked at them very carefully, because this was obviously very important information.

Infinite war, it is impossible to allow contestants to cheat, so often the power system is very unique, to prevent contestants from using the exercises they have mastered to cheat, after all, some contestants are actually super strong, mastering many very terrible techniques, if you can practice in the world of competition, then you may beat other contestants in minutes.

This is clearly not allowed.

So in the world of each game, the power system is absolutely unique, and there will be no possibility of cheating.

Zhang Sen analyzed that the power system of this world is likely to be the dieter system, which needs to use the special creatures of this world to strengthen itself through diet and medicine, and finally obtain extraordinary power.

It can be said that this is a system that is very dependent on foreign substances, and it needs to be specially formulated in this world to be able to carry out.

Zhang Sen now gets a recipe, albeit a flawed one.

Shadow flea formula, now the remaining problem is to solve the weakness of the shadow flea itself, Zhang Sen carefully read the information, and quickly analyzed it in his head.

Old man Hemerway has studied shadow fleas very thoroughly.

This is originally a special creature that lives in caves, because of its very strong reproductive ability, it is easy to eat up the food in the habitat, so the shadow flea has gradually evolved the ability to absorb heat, and can absorb the heat in the cave to maintain its basic needs.

It can be said that the ability to absorb heat has little to do with the ability to hide.

In fact, Hemerway already has a part of the solution, that is, to remove the heat-absorbing part, and then use the remaining part to make medicine and meals, and slowly change the characteristics of the body, so as to gain ability.

It's a pity that he died in the fire created by Zhang Sen before he figured out that part of the shadow flea would absorb heat, just like another player who was indirectly killed by Zhang Sen.

Zhang Sen accepted Hemerway's research results in full, and did not rush to do experiments in the next few days, but went into Hemerway's study to read.

The doctors of this era can be said to be very high-end intellectuals, and Hemerway's collection of books is very rich, and there are books in all aspects.

Through these books, Zhang Sen finally has a general understanding of the world.

Originally, Zhang Sen thought that this era was similar to the era of the earth's great geographical discoveries, but in fact it was not.

This planet is very huge, it is impossible to explore it with the current human technology, and there are many unique and dangerous creatures on this planet, forming many forbidden areas for humans.

Because of the existence of these forbidden areas, the human habitation is divided into dozens of pieces, equivalent to dozens of kingdoms or principalities, and empires do not exist.

At present, human beings have only explored about 10% of the area of this planet, and even there are many unknown islands in this 10% area, such as the island where Zhang Sen is now located is not in the navigation map.

Through Hemerway's identity, Zhang Sen roughly determined that the location of this island should be close to the kingdom of Zankelu, and through this information, he knew which direction he should sail in once he went to sea, so as not to plunge headlong into the forbidden area of humans.

He spent a week reading through most of the useful books in his study, and then began the Shadow Flea experiment.

Although he drove all the shadow fleas away from the island with a single fire, there would be more than a dozen shadow fleas in Hemerway's laboratory, and even hundreds of shadow flea eggs, so he could hatch and grow a large number of shadow fleas if needed.

In fact, the shadow flea seems terrifying, but in essence it is not a particularly terrifying creature, and the reason why it has become the overlord on this island is because there are no natural enemies on this island.

In the kingdom of Dangkelu, there is a creature called the fire hairy monkey, which has long hair that exudes fire, and likes to eat shadow fleas the most, and the result of the shadow flea encountering the fire hairy monkey is a dead end, so in the kingdom of Dangkelu, it is impossible for the shadow flea to grow wildly, there is a perfect food chain, which suppresses the number of shadow fleas very well.

Although there are occasional unlucky eggs that crash into the Shadow Flea colony and are eaten up, this is only a small chance event and is not enough to cause panic.

The kingdom of Sauklu has people who specialize in raising fire hair monkeys, and once they find shadow fleas around the city, they will take fire hair monkeys to clean them up.

Fear comes from the unknown, and knowledge dispels fear.

After Zhang Sen thoroughly understood the creature Shadow Flea, he naturally no longer feared the Shadow Flea, and treated this strange creature with a normal heart.

As a wizard, he also has a deep understanding of pharmacy, but this knowledge is completely useless in this world, because potions are really only an adjunct, and the diet is the most important part.

Dietetician, why the word "food comes first" and the word "medicine comes last" is actually because diet is more important than medicine, and medicine actually only plays a catalytic role.

Zhang Sen found that the dietetic needed specific catalysts to help him absorb those specific meals, and he probably didn't need to, because he had the characteristic of a 'person with a big stomach', and his own absorption capacity might be as high as that of a typical dietetic after taking the medicine.

However, this still needs further experimental observation, after all, he does not know how far the talent of a person with a big stomach can go.

For the next few days, he was busy researching and solving the shortcomings of the Shadow Flea.

In his opinion, the diet is actually more inclined to medicinal food.

It's just that the medicinal diet of this world has developed a unique power system and has become a profession, and a powerful dieter may have unimaginable power for ordinary people.

"I see, there are actually two kinds of body fluids in the body of the shadow flea, although the two are of the same origin, but the body fluids in the arteries and the body fluids in the veins are completely two body fluids."

Zhang Sen's test level can complete Hemerway's experiment, and naturally the experiment soon made a new breakthrough, why shadow fleas are afraid of sunlight, it is because the fluid in the arteries already has the property of absorbing heat, and the body fluids in the veins can convert these heat into the energy needed by the body.

To put it simply, if you want to get rid of the weakness of the shadow flea and not absorb that weakness yourself, the way is to empty the fluid in the arteries and not eat that part of the fluid.

After determining this, Zhang Sen prepared a meal and fed it to the white mice kept in the laboratory.

The white rat ate ate it through diet and medicine for a week, and its body finally disappeared.

Of course, this is not really disappearing, but being able to hide itself in the shadows.

Next is the most important part of the experiment, Zhang Sen will be able to hide in the shadows of the white mouse to the sun, if it is a failure, then it will be scalded to death, if it succeeds, then it will be exposed to the sun.

The results speak for themselves, Zhang Sen's experimental level is obviously countless times stronger than that of the old man Hemmerway, the white mouse is running around in the sun, and then it is finished by Zhang Sen with a knife.

After confirming that the experiment was successful, Zhang Sen began the second experiment, and this time there were no white mice, because he was a white mouse himself.

The experiment is very simple, that is, to test whether the talent of the 'man with a big stomach' can replace the catalytic agent.

This is actually a very dangerous experiment.