Mavi remembered the plague of rats he encountered in New Ross.

The bubonic plague outbreak in New Ross City is very similar to this widespread dysentery incident, both of which broke out suddenly in a short period of time, catching everyone off guard.

By the time you notice something unusual, it's too late.

After checking the condition of Levin and Daniel to make sure that their lives were not in danger for the time being, Mavi took Unia and Edward, who had just woken up, out of St. Basil's Cathedral.

In the past, the crowded streets seemed a little empty, and there were few pedestrians in sight, and occasionally doctors with medical kits ran in the morning breeze with their hats, knocking on doors and checking on patients.

The monks of the Church of Truth were also recruited, and many of them were lying in bed unable to move, and they were extremely weak.

"Where's Fat Orange? Did it have an accident? ”

"Archbishop Fat Orange is fine, he was the first to find out that the situation in the city was wrong, let me rush to inform you, and I took the cat to investigate first." Christopher said.

"Hmm...."

Just as Mavi was deep in thought, considering where to start the investigation, the doors of the Kremlin opened, and Katerina walked out with Bodlinov and a group of other guards, apparently relieved to see that Mavi was safe and sound.

"Priest!" Katerina hurried.

"Your Majesty, it's fine that you're okay."

"What's going on? Why did there suddenly break out of cholera in the city? ”

Katerina's doubts, Ma Wei couldn't answer for a while, and he was wondering.

"Your Majesty, we should gather all the people who are still able to move, investigate the sick residents, and ask them what they have been exposed to and eaten in the last two days."

"What if the disease is contagious?" Katerina asked, "There are so many people who are already sick, if the rest of the people are infected again, Mosk will be in a state of stagnation!" ”

"It shouldn't be contagious, Levine and Daniel were hit, Dino and I had close contact with them yesterday, and today is fine, either this disease has an incubation period, or it is not contagious, I think the latter is more likely."

Mavi does not think that this is a cholera, no large-scale infectious disease can suddenly break out in a short period of time, and in one day, half the inhabitants of the city will collapse....

Virus infection also takes time, and this is all basic common sense.

"Bodlinov, you lead people to conduct a door-to-door investigation, and you must find out the source of this epidemic!" Katerina made a decision.

"Yes!"

Bodelinov waved his arm and immediately mobilized his manpower to launch a large-scale investigation campaign.

After the guards left, Mavi looked at Yunia beside him: "Yunia, you bless the holy water to see if the holy water can cure this epidemic." ”

"Got it!"

The crowd returned to the church, prepared a bowl of holy water blessed by the goddess, and went upstairs.

Christopher picked up Levin, who was lying on the bed, and poured the holy water into his throat little by little, and Ma Wei and the others waited nervously, hoping that the holy water would cure the disease this time, just like last time.

But....

Levin, who drank the holy water, did not get better, his face was still sallow, and his spirit was sluggish.

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【Father Ma Wei】 【】

"Dad, it's not a curse that's causing this epidemic." Seeing that the holy water had no effect, Yunia turned her head to look at Ma Wei: "I don't feel the existence of other curses in Uncle Levin's body...."

"Don't...."

Suddenly, Levin, who was lying on the bed, opened his eyes violently and sat up as if he had returned to the light, startling everyone.

Seeing his eyes glaring and squirming his mouth with difficulty, Christopher hurriedly stepped forward to listen to his voice like a mosquito.

Katerina asked, "What did he say?" ”

"He said...."Christopher looked at Unia with a strange expression, "Don't call him uncle...."

"When is this time when he still cares about this!"

Ma Wei almost fainted, he knew that Levine had an inexplicable obsession with the title of 'uncle', and he had never liked Yunia to call him like this, but he never thought of it....

Levin, who had collapsed and was on the verge of a coma, still had the strength to refute....

"Feed him more water, and let him rest well!"

Leaving Christopher to take care of Levine and Daniel, Mavi and the others went to the living room on the first floor and began to search for the source of the epidemic according to the information sent by Bodlinov.

Around Red Square, the area where dysentery broke out the most, many of them were families of three who fell at the same time, and the sick could not get up.

The food they eat is normal, no different from what they do on weekdays, a few pieces of bread, a few pieces of butter, corn soup....

Even the ingredients used for cooking are bought from different markets, from several towns around Mosk, there are many infected families who do not even cook, eat some canned food and other things, how can canned food be the source of infection?

If canned food is the source of infection, then how did other people who did not eat canned food get infected with the disease?

Different activity areas, different food eaten.... The only thing that is the same is that the areas of large-scale outbreaks are almost always concentrated near the riverside.

Mavi stuck nails representing the dwellings of the infected on Mosk's map and discovered this peculiar phenomenon.

"Father, this...."

Katerina looked at the dense nails on the map and said in surprise: "The area where the epidemic outbreak is most serious seems to be near the Mosk River!" Could it be that there is a problem with the water source?! ”

The people who live in Mosk consider the Mosk River, which runs across the city, to be their mother river, and the city is built on the water, and the water source for its daily life comes from this wide river.

If there is a problem with the water source....

That would explain the cause of the massive outbreak of the disease.

Ma Wei couldn't help but think back to the food he ate yesterday, when he got up in the morning, he ate two slices of butter bread, a stack of scrambled eggs, and drank a cup of hot tea, and ate mutton borscht with bread at noon, and he had no appetite in the evening, and he didn't eat....

I drank water yesterday!

The source of water for St. Basil's Cathedral also comes from the Mosk River!

Almost all the monks who worked in the church fell, but he, Unia and Edward were unharmed.

Full of doubts, Ma Wei found the chef Mocelli hired by the church, and after careful inquiry, he found that....

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【Father Ma Wei】 【】

The water used for cooking yesterday morning and noon did come from the tap water pipe, but the key to the problem was the mutton borscht eaten at noon, this dish needs to be cooked for a long time, so the chef began to prepare ingredients for stew early in the morning, and the food that Ma Wei ate at noon....

The water comes from the morning!

And in the evening, the food prepared by the church, Mavi did not eat, and the monks who had eaten dinner.... All infected with the blight!

The more you eat, the worse your symptoms become!

"It looks like there's really something wrong with the water source..."

Mavi looked at Katerina: "Your Highness, didn't you eat last night?" ”

"I had a barbecue with vodka last night." Katerina pursed her lips and said: "Last night, Bodlinov and those guards held a bonfire and invited me to eat some .... Could it be that someone poisoned the river? ”

"The Mosk River is fast, and if you want to achieve the effect of large-scale infection, you must continuously release poison, and the fish in the river should have died long ago, not to mention what the poisoners put laxatives into the river for? Even if you poison it, you should put a deadly poison! ”

"You mean, this wasn't a deliberate poisoning incident?"

“.... It would be nice to go to the Mosk River and do a field survey. ”

After determining that there was a problem with the water source, everyone immediately set off and came to the bank of the Mosk River, where the riverbank was full of gravel and cats.

"Yikes! It's a fat orange! ”

At a glance, Yunia saw the fat orange crouching by the river, staring at the flowing river, its expression solemn and its eyes full of vigilance.

Apparently, Fat Orange was one step ahead of them and discovered the problem with the water source.

Hearing the footsteps behind him, Fat Orange glanced back and said in a calm tone: "I was just about to inform you, there may be a problem with the river water, and the cats and cats who drank the river water yesterday have serious symptoms of dysentery." ”

"Where's Blackie?"

"It was tricked, and it screamed like killing a pig, and kept shouting that big brother save me big brother save me meow big brother save me meow..... I was so upset that I knocked it unconscious. ”

“......”

He's your most loyal little brother....

It's a shame that you've gotten rid of your claws.

Shaking his head, Ma Wei remembered Xiao Hei with pity for half a second, and then turned his gaze to the river.

Under the calm surface of the river, mixed with dirty mud, although it is called the mother river, but the people who live in Mosk, will still dump feces and dirty water into this river, the river flow rate is high in summer, can take away the dirt in the river, once in winter, the river flow rate drops....

The whole river will emit a strong stench that will permeate the sky over the city and linger.

Just as Mavi was quietly observing, Yunia suddenly grabbed his sleeve.

"Daddy, there's something in the river swimming through."

Stuff?

Ma Wei looked intently, but did not find anything unusual under the calm river, but found a few.

Yunia didn't talk nonsense, she must have seen something that she couldn't see with the naked eye to say this, Mavi observed the river, quietly took out the Siren's Tears, and held Yunia's little hand.

The majestic divine power poured into the god's body, the muscles and bones clicked and exploded, the vision suddenly became clear, the flow of the river seemed to slow down, the sludge could no longer block the view, everything became nuanced....

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【Father Ma Wei】 【】

This was the first time Mavi had borrowed her power after Eunia's ascension, and the endless power filled her body, and the warm sensation flowed through her limbs, with an intoxicating and addictive magic.

Behind him, Edward looked at Ma Wei, who had borrowed Yunia's divine power, his pupils shrank imperceptibly, and he quickly returned to normal.

The invisible bone wings stretched behind him, and Ma Wei moved his neck to look at the river again.

In the surging water, a faintly gelatinous object swims at an extremely fast speed, and in the blink of an eye, it merges with the river water, and is extremely difficult to spot.

Fish?

Transparent fish?

Wrong.... Not fish ....

Looking at the clear gelatinous objects that swam along the river into the distance, like the transparent gelatinous objects of a migrating army, Ma Wei clenched the tears of the Siren, and the soles of his feet were slightly forced.

The Siren's tears burst out with dazzling light, and the wide river channel suddenly parted, and the river broke in two, revealing the muddy bottom of the river, and with a bang, several monsters with blue bodies broke through the water wall and fell into the mud, the upper half of their bodies were the same as those of humans, but the lower half of their bodies were the tail fins of fish.

"This is..."Katerina recalled the "Catalogue of Alien Beasts" she had read, her eyes narrowed, and she had some impression of the blue monster in front of her: "Water Demon Sairan! ”

"It's indeed the water demon Sairan, that's right."

Ma Wei, who had also flipped through the texts of the Heavenly Apocalypse Divine Cult, also saw through the identity of the monster.

Water demon Sairan, a transcendent creature living in fresh water, the whole body is blue, when swimming in the water, the body will be integrated with the current, difficult to find, with ethnic sex, rarely act alone, all are females, eat fish for a living on weekdays, will not take the initiative to attack humans, only when it comes to the mating period, will swim towards the sea, to find another group in the ocean.... Sirens.

The Sirens, also known as mermaids, are all males with beautiful singing voices and girlish appearances, who like flesh and blood, and who live in the sea, often raiding passing ships at night, relying on their appearance and singing voice to charm sailors and drag them into the depths of the ocean to share their food....

Before reading the texts left by the Apocalypse Cult, Ma Wei, who had many years of sailing experience, had always felt that mermaids were females, but in fact....

They are all male.

The mermaid princess in the fairy tale is actually the Seran tribe who swims into the ocean to find a mate during the mating period, and they occasionally can't find the siren, but the mating period is only a short month, in order to continue the group, the female water demon of the siren tribe can't be found, and it will become a human and go ashore to find a mate.

Reproductive isolation or something, it is not a problem at all for the half-human and half-fish Sairan tribe, although they live in fresh water, but they are very close to humans, and the female water monster is not very aggressive, which is completely different from the bloody and brutal Siren.

The danger in the sea has created the cruelty of the Sirens, and the warmth of the fresh water has also created the softness of the Siran people.

If you see two beautiful mermaids intertwined in the shallow part of the sea while sailing, don't panic, it's the sirens and the sirans who are mating, and the sirens will not take the initiative to attack humans until the mating is over, but if the mating is over, the sirens will show their bloody side.

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【Father Ma Wei】 【】

Curiosity kills people, and it's not an empty phrase.

The right thing to do is to turn around and run, unless you have the absolute strength and confidence that you can defeat the Sirens who are ravaging the sea.

As for the root cause of water pollution and epidemics, the truth was revealed after the existence of the water demon Sairan was exposed.

Although the water demon Sairan has a gentle temperament and does not actively attack humans, where they swim, an algae plant called Blue Moon Algae grows, which emits a blue fluorescence when illuminated by the moonlight, hence the name.

At the same time, the blue moon algae emits toxins that have a lethal attraction to fish, similar to catnip in a cat's eye, attracting schools of fish to congregate and thus providing a large amount of food for the Seran people.

This toxin cannot be killed by high or low temperatures, and if humans drink the water that grows the blue moon algae, it will not be fatal, but....

Will have diarrhea all the time.

Pull until the toxins are completely digested and metabolized by the body.

In ancient times, if constipation occurred, people would go out at night to find the water source for the growth of blue moon algae, pick a plant home, grind it into pulp water, and give it to the constipated person, which is a very ancient laxative, with the disappearance of the Seran people, the blue moon algae became extinct, and this method was lost.

Now that the calamity has struck, the Seran people have reappeared in the world, and they happened to pass through the Mosk River, which caught Mavi by surprise.

What makes Mavi a little strange is that the Seran usually have their own fixed habitat, such as a wide inland freshwater lake, where they settle and rarely swim around, and their mating period is late autumn in October, and there is still a full month to go, why do they appear in droves in Mosk?

Just when Mavi was puzzled, a dark blue body emerged from the water, and fine scales appeared on the beautiful face, and the Seran people were angry that Mavi interrupted their migration, but they were afraid of Yunia standing beside Mavi, and their keen intuition of danger made them realize the strength of their opponents.

One by one, the water demons bared their teeth at Ma Wei, but did not dare to attack, trying to scare off the enemy with a threatening roar in their throats.

"Priest...."

Katerina leaned behind Mavi and whispered: "It is recorded in the classics that the tears of the Seran tribe are extremely precious secret medicines, which can be encountered but not sought, and now the calamity is revived on a large scale, and the appearance of the Seran tribe is a sign, if the legendary plant appears again, the ancient medicine can come in handy..."

"Your Majesty, no matter how precious a treasure is, we must also consider whether it is advisable or not, the behavior of robbers is not the truth."

"Aren't you tempted?"

"Tempting, but the civilization created by mankind, one of the most important is morality, and a country of corrupt virtue will not last long." Ma Wei said quietly: "A gentleman loves money and takes it in a good way. ”

"But Dad, you were the vice-captain of the privateer!" Yunia said with a wink.

The corners of Ma Wei's mouth twitched slightly: "Oh.... I have changed my mind, and the Battle of Perea is our punishment. ”

"And what about them?" Katerina watched as she surfaced, and more and more of the Seran Water Demons asked, "Caused us so much trouble, should we just let them go?" ”

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【Father Ma Wei】 【】

"Hmm...."

Ma Weiloga pondered, and said to the Sairan Water Demon in front of him, "If you can understand what I am saying, please ask your patriarch to come out and see you." ”

After a short silence, the river suddenly churned, and the water demons retreated, a huge figure....

Floated out of the water.