The boss of this layer is likely to be the one who manages all these studies, sitting down on the ground and slowly recovering his health and mana, Mu Feng thought.

"Dad, I'll help you!" Xiao Xi, who had been flying beside Mu Feng, waved his hand and scattered a green point of energy light, and under the effect of nature's blessing, Mu Feng's health and mana quickly recovered.

"Thank you, Xiaoxi. You must be tired these days, right? Mu Feng stretched out his hands to give Xiao Xi, who had grown up, a foothold, and Xiao Xi flapped the beautiful little wings behind him and gently landed on Mu Feng's palm. With a slender figure, her toes were light, making Mu Feng feel as if she had no weight.

"Hee-hee, it's my job to help my father! But...... If only Dad could give me some rewards! With an intoxicating smile on her face, Xiao Xi turned around happily.

"Do you want this?" Mu Feng took out a pet cake from the package, which was worth 5,000 gold coins!

"I want, I want! Daddy, give it to me! Seeing the delicious pet cake, Xiao Xi immediately lost her mind and pounced.

"Take it." Every time Mu Feng rests, he will give a pet cake to Xiaoxi, but Xiaoxi always looks like he can't eat enough. Learn from Mu Feng's example, girls with pets can also lose. They followed suit, anyway, they are not bad for money, and they don't know how to spend so many numbers in the bank. The undead birds that have just hatched and have not been many days old Xiaohuo and Qinfrost's Thunderbolt also eat pet cakes.

"Daddy is the best! ~" Xiao Xi picked up a pet cake several times thicker than her waist, flew in front of Mu Feng, and gently left a kiss on Mu Feng's side face.

Seeing the harmonious picture of the two fathers and daughters, the girls sitting around couldn't help but laugh. Everyone can't hide their love for Xiaoxi.

"Xiaoxi, my mother also gave me a big cake!" Another cute elf, Yuyi, who was almost carved out of the same mold as Nozomi, flew over, holding the big cake that Asuna gave her. The two girls are almost the same size, only one has black hair and one has green hair, and the color of the wings is slightly different.

"Really? That's great! "The friendship between Xiaoxi and Yuyi, but it started when Xiaoxi couldn't speak, and the two of them quickly ignored everyone and started playing. Qiuqiu, who can only be at a low level on the side, can only spin there by himself, or is bullied by Xiao Xi and Yuyi as big toys and vehicles.

"Alright, it's time for us to go!" Ten minutes later, everyone was refreshed. Mu Feng stood up and said to everyone.

"Yay! ~Go and destroy all the monsters! Sitting on Mu Feng's shoulder, Xiao Xi also raised his slender right hand and shouted. It made everyone laugh.

When everyone was resting just now, Qin Shuang heard Mu Feng say that the boss should be below, and she wanted to change the lineup, but Mu Feng refused. What is lacking in the world now is definitely not output, two more tanks, but there is a greater chance of knocking the boss into the berserk stage at one time.

Four tanks are in front, and behind them are the outputs and healers. As soon as I came to the huge mechanical gate in front of me, I saw that the lights were flashing on it, and all kinds of gears kept turning, and they slowly opened like this.

"Be careful!" Streams of colorful smoke spread from the other side of the door, and Mu Feng immediately asked everyone to be careful. After the smoke came to his feet and found that there was no harm, Mu Feng and the other three tanks took the lead in entering.

"Welcome to my laboratory, guests from the Skyrim Continent! Haha...... "A strange male duck voice came out of it.

When everyone got used to the light, they realized that this was a huge laboratory. It's full of all kinds of strange experimental utensils and materials. The mess of light and smoke here is caused by those things.

And in this messy laboratory, there is only one monster waiting for everyone to fight, and that is the boss of the entire fourth floor, Dr. Bangbang!

Dr. Bang Bang: Level 80 Jin Ying boss with 80 million health. As the ruler of the Dark Citadel, Dr. Bang is about to invent. Guarding the fourth floor of the Dark Fortress, he made all kinds of powerful and strange inventions for the Demon Legion's Qigong.

"It's really called Dr. Bang Bang!" Mu Feng smiled dumbly, when he met the demon researcher and other monsters before, the monster information mentioned Dr. Bang Bang, but he didn't expect it to be such a guy.

"What, do you dare to underestimate me?" Dr. Bang Bang's real body turned out to be a green-skinned villain who was about the same height as a dwarf! Its wrinkled limbs are dry and thin, but it has a round belly, and it looks a little like a frog from a distance. However, since it is a demon, it naturally has demon wings and demon horns. It's just that even these two things are green and look a little disgusting.

Dr. Bang Bang held two bottles of bubbling glassware in his hand and looked at everyone who broke in. The tone of welcome that had just turned into anger under the curious gaze of everyone.

"In that case, you all become materials in my lab! It just so happens that I've run out of materials here! "I didn't expect this green toad to be ruthless enough, and directly classified the 40 people here as experimental materials!

"Then it depends on whether you can beat us!" Mu Feng discovered that the boss here will definitely be reincarnated infinitely because it is a dungeon boss, and Skyrim is not designed with too much intelligence. There's nothing to communicate with, just go straight to it!

"Up!" At the sound of the order, Sophie rushed forward......

That's right, this time it's Sophie who will carry the boss, after all, it's just a temptation, and it won't necessarily pass. It is impossible for Mu Feng to turn on the demon value burst resistance. He has a total of 1,000 demon points to resist for more than ten minutes, and even if the boss battle is over once, it will be close to ten minutes of battle.

"Come here!" Sophie's shield shattered the two glassware in Dr. Bang's hand, and it was so angry that it thundered.

"You are looking for death! I'm going to wipe you out with my invention! "Dr. Bang Bang jumped like a frog, and with the help of his wings, he actually got into several huge machines behind him!

"No wonder the boss is so small, it turned out to be a ...... of Gundam" Mu Feng couldn't help but complain, but now is not the time to complain, because Dr. Bang Bang has already driven the weapon he invented to the wrong one!

"Bang! ~"The guy that Dr. Bang drove out is a bit like an otherworldly version of a tank, but the parts have been replaced with some special devices, which are a little different from those in the real world, and the same thing is that there is a huge cannon and a place to fire machine guns.

"Oh no! ~My new experimental material, my results! Dr. Bang's voice rang out in the tank, and its tank ran over all the way, destroying his own laboratory before it could hurt a single hair.

"How can you resist this!" Sophie said depressedly, such a huge tank just crashed into it, and she couldn't fly away!

"Don't be afraid, since it's a boss, you will definitely be able to resist, you go to the top first." Mu Feng's words gave Sophie confidence, no matter how big it is, it is death and rebirth. Sophie gritted her teeth and used her hatred skill to throw it at Dr. Bang's tank again. He also raised his shield and rushed forward.

"Bang! ~"There is no suspense, how can people fight against machines? Sophie was knocked straight into the air.

"I'm coming! ~"The little demon fairy doesn't believe in evil, and when he saw Sophie being knocked away, he immediately turned on his defensive skills and came up.

"Bang! ~"Flew another one.

"I'll do it too! ~"Seeing that the two sisters were flying, the anti-war girl was embarrassed not to go up, and now she is the only one left in the orthodox tank, raising her shield and charging!

"Bang! ~ "It's not easy to charge, just fly upside down!"

"Damn, isn't it, so fierce!" Mu Feng shouted depressedly, do you really want to fight by yourself? However, looking at the three Sophie, although they were knocked into the air, they were not too badly injured, and the doctors easily saved their lives. Seeing this, Mu Feng also had a little bottom in his heart.

"Let's disperse first and see what the hell this boss is going to do!" To rush up is to be knocked off, and you must not be able to get on. The tanks haven't built up enough hatred to be able to reach long range, so what if the black muzzle of the thing is aimed at them? The best way to do this is to stop attacking first and see if this big guy will stop after all.