The walls of the Iron Lock Fortress are particularly high, and on the flat ground between the two mountains, the Molai people have made black rocks that have been reinforced with magic.

In front of such an astonishing high wall, all kinds of siege equipment seem to be weak, especially the terrain of the iron lock fortress is still on a slope, and if the Thracians want to attack the city, they must carry arrows and throwing stones, along the slope, and also fix their siege equipment on the slope, which is very difficult.

The Iron Lock Fortress did not completely block the mountain roads, and both sides were usually open for convoys to travel. But how dare the Thracians march all the way to the fortress during the war? It was against stones and magic thrown from their heads, and it was not a very short road, several miles!

This kind of thing is definitely not something that any intelligent creature can do, except for the low-level necromancers who have no wisdom and feelings, and don't know what fear and frustration are, even the most courageous orc berserker legions can't withstand such a crazy march, maybe they can persevere, but when they get out of this "road of death", their morale will be extremely low. At that time, as long as a few hundred people are arranged in front to block it, the whole army will collapse.

But...... No matter how strong a fortress is, it is only a fortress after all. It could hold on for a day or two, maybe a year or two, and maybe even become the border between the two countries in the long years after that, like the Norma Line, but it couldn't make the Thracians retreat.

Standing on the tall and wide city walls, Brev Sellers, the new "famous general" of the Federation, looked melancholy at the Thracian barracks a few miles away, and sighed deeply.

"How can I win?" he said to himself, "no matter how you think about it, you can't win......"

"Why can't you win?" asked a cold, seemingly undevoid voice.

"If the enemy only has two wings, the Sellers family will not be able to defeat them, with our Sellers family as the vanguard, and charge to the death. Brev pointed to the barracks in front of him and sighed, "But...... There's Pitutz here!"

"Duke Pituz?

"When Thrace was founded, there were two famous generals, known as 'attacking like the wind, defending like a mountain', and the titles of Duke of Storm and Duke of Mountains came from this. The Pidoutz family has always focused on defense, and with them in charge of the Chinese army, even if we try our best, we can only shake one of the left and right flanks of Thrace, and there is no way to force them to retreat. Brev explained.

"That shows you're not strong enough. ”

"yes, we're not strong enough!" Brev clenched his fists.

"That's why I needed my help, and thanks to my patronage, my research progress has improved considerably. ”

Brev smiled.

After laughing, he asked, "How many synths did you bring this time?"

"Luckily, the Thracians gave me enough time to prepare. Even standing on the city wall, Aaron, who was still wearing a white coat, as if he had crossed over from some research institute on the earth, still said with a blank face, "There are a total of 30,000 units of high-quality mutagenesis in reserve, and if nothing else, more than 24,000 synthetic beasts can be mutated." ”

"More than eighty percent of the success rate?" Breve was startled, "Remember when you told me on the road, the success rate was only about thirty percent, right?"

"At that time, I was poor, I did not do much experimentation, and I did not have enough materials. Now that I have enough materials and can do enough screening experiments, the success rate is certainly high. Aaron said, "And this synth beast is different from what I showed you at the beginning, its constitution has been strengthened, and its controllability has been improved a lot." When tested in real combat, when facing ordinary soldiers, the advantage is already quite obvious. ”

Speaking of this, the corners of his mouth finally curled slightly, and there was a little smile.

Brev looked at his smile, but couldn't help but shiver in his heart.

Unlike those animal trainers who didn't know anything about it, as the person who came to invite Aaron in the first place, he talked to Aaron a lot along the way, and he knew very well how Aaron's mutagenic potions were researched, and some kind of "key materials" needed to produce them.

Abundant materials, screening, 30,000 units of pharmacy...... Behind these numbers is something that makes the new generation of fierce generals of the Federation fearful.

He swallowed and foamed, pushing away the creepy stuff in his mind, and asked, "When are you going to put the synth into combat?"

"It depends on what Command means. Aaron said nonchalantly, "I'm just a scholar, and I'm only responsible for making them." If it weren't for the fact that I wouldn't have left Prison Island at all to see the results of the massive use of synths and see if I could find some problems—what's so good about fighting? ”

(Prison Island is now known as "Hell Island" or "Alcatraz Island"!)

Brev smiled reluctantly, and then said, "Those mutagens...... Do you have to wait until you fight?"

"In fact, it's not impossible to use it in advance, it's just that the food of synthetic beasts is relatively large, and you can save a lot of military food by using it again before the battle. "After all, they eat meat, and it's not good to waste it." ”

"How can we solve the problem of military rations when the war is reused?" Brev asked curiously, "Even if the dead don't care about the military rations, there will always be survivors." ”

Aaron glanced at him: "After a battle, there is so much meat to eat on the battlefield, why worry about the problem of military rations?"

Brev was stunned for a moment, then understood what he meant, and suddenly felt like he had been poured a basin of ice water from head to foot, and he couldn't help but tremble even the muscles in his calves.

So he hurriedly turned around and went down the city wall, not daring to stay here for even a minute.

He was afraid that he would stay any longer, and he would either be unable to resist slashing Aaron to death with a sword, or he would not be able to help vomiting.

Aaron didn't care about Brev's departure, and silently watched the barracks ahead.

Thracians came in large numbers, more than he expected.

It's a good thing, the synth is making its first public appearance in this world, and it needs a big enough stage and a group of enough supporting characters.

He wasn't worried about the performance of the synths, the war machines he had designed were enough to make anyone who hadn't fought against them suffer a lot.

At this moment, he was thinking about other issues.

(The wolf-like Synth has limited potential, and no matter how much it is improved and improved, it will not make much progress...... Sure enough, we should shift the direction of research to slime-like synths. ）

(But how do I convince the Confederation to accept my opinion?)

(It's too much ability, too much technology, and it's also a very hard thing...... ）