HK416 Assault Rifle + M320 Grenade Launcher.

TRGM10 Bolt-Action Sniper Rifle.

Flashbangs, Grenades, Flash Grenades, RPG Rocket Launcher.

No. 15 Steam Kinetic Heavy Hammer from the Ruined City, Thunder's Secret Contract.

For protective gear, Yu Yuan still chose the Commander Set.

As for those bullets, medical supplies, Rare Artifacts, food, and drinking water, Fang had already helped prepare them.

All were reorganized and stored away by Yu Yuan into the Rabbit Ring.

When everything was ready, there were still over three hours left before the Truce Period ended.

"Investor, you must be careful this time!"

Yu Yuan gave a light chuckle, then walked over to her Workshop.

Masier was currently programming on her computer, designing an automatic writing program. This was Yu Yuan's request.

The purpose was to fully utilize that Rare Artifact, the [Pen of Longstanding Heritage].

After the incident with Fang, Yu Yuan now dared not let anyone else use this pen, so he thought of having Masier build a device. It didn't need to be too complex, just something that could use this pen for writing.

This way, they could not only continuously obtain the wonderful information revealed by the pen but also avoid the threat posed by the written information to the members of the shelter.

Previously, Masier had been busy with the weather balloon project, which is why it had been delayed until now.

"How's it going, Masier? Approximately how long until this device is ready?"

"Hmm~ Programming plus device fabrication and debugging... all together, 7 to 10 days!"

Hearing Masier's words, Yu Yuan nodded slightly.

If it was only 7 to 10 days, that was already quite good.

Yu Yuan prepared to leave. He didn't plan to launch the invasion from the shelter; he intended to go to the Aurora Animal Assistance Association.

Mie Mie and Zhi Zhi had already come to Yu Yuan's side. Knowing Yu Yuan was about to go to another world to launch an invasion, everyone came to see him off.

Due to the previous player invasions, except for Simon's family, everyone else knew what an invasion war was like.

Moreover, this time Yu Yuan was invading that vampire who escaped last time.

Through Fang, they all learned about the strength of that vampire.

Although they also knew about Yu Yuan's and Zhi Zhi's strength, they were still somewhat worried.

"Alright, I'm off. I leave the shelter to you all! Especially the area near our shelter, keep a good watch, don't give anyone an opening."

"If there are any special circumstances, contact Alpha directly."

After giving his instructions, Yu Yuan chuckled lightly and walked with Mie Mie and Zhi Zhi towards the Security gate.

Step by step, they passed through the multiple doors of the three-layer isolation, opened the airlock door, and a rush of icy cold air surged towards the shelter. Fortunately, the multiple doors isolated the airlock from the interior of the shelter, so the cold air did not flood into the shelter.

But Yu Yuan couldn't help but shiver.

Today's temperature was still minus twenty degrees Celsius. Yu Yuan had long since put on a full set of warm clothing, plus the Fire Wolf hide vest worn innermost under his clothes provided heat.

Yu Yuan just shivered once and didn't really feel that cold anymore. As the airlock door closed, Yu Yuan led Mie Mie and Zhi Zhi towards the sewer.

Watching the closed airlock door.

Although they knew Yu Yuan's strength, everyone silently prayed.

"Investor, be safe!" Masier pursed her lips.

Simon turned and walked downstairs. When he learned Yu Yuan was going to another world to fight, he had offered to accompany him.

But Yu Yuan refused. He knew the reason.

He was too weak.

Simon had naturally seen the captured [Swiftstrider] Infected these past few days.

Looking at that terrifying monster that was clearly not a normal human, Simon understood that the battles the other faced were simply not something he could handle.

Precisely because of this, a deep sense of frustration and indebtedness arose in Simon's heart.

"If I were just a bit stronger, a bit stronger still, could I have helped him then... No, I need to work, do more work. Right, the wild chives are ready for seed collection, go collect the seeds...."

*Tap tap tap—*

Yu Yuan didn't know about Simon's thoughts. At this moment, Mie Mie was carrying him as it ran through the sewer.

But its speed was considerably slower than usual.

There was no helping it.

The blizzard had been falling for three days straight. Not only was Green Forest City covered in ice and snow, but even the ground and walls of the sewer were covered with a thick layer of frost.

The manhole covers were even frozen shut by icicles. The surface and the underground had become two separate worlds.

If Mie Mie wasn't careful, it really could slip and fall.

Yu Yuan frowned slightly. The frost in the sewer was thicker than yesterday's. And this was just the beginning. When the third phase arrived, who knew what it would become.

Soon, Yu Yuan arrived at the Aurora Animal Assistance Association.

Mona was waiting. Yu Yuan followed her to a large hall where Jiu Feng and Miller were already present.

In a moment, Yu Yuan would launch the invasion war from here.

The hall was equipped with many instruments and monitoring devices that could monitor the entire process of Yu Yuan's departure.

Although these devices couldn't compare to professional experimental instruments for physical research, they were the best monitoring equipment the Aurora Animal Assistance Association could find.

"Sir, based on our dissection research of the Lizard and Bat People over the past few days, we can confirm their living environment is deep underground.

From the toe gaps of the Lizard, multiple metal and carbon mineral components were detected. We speculate they likely live deep within an underground mine, or there is a mine near the activity area they mentioned...."

Jiu Feng led Yu Yuan to the room next to the hall, which was precisely the underground command center.

Research data on the Bat People and Lizard appeared on the command center screen.

First were the various plant and biological remains found in the stomachs of the Lizard and Bat People.

Then came the monitoring data of the Bat People's eyes, skin, etc.

"Sir, generally, plants obtain energy through photosynthesis or feeding, and basically all contain chlorophyll components. However, not a trace of chlorophyll could be found in these plant remains.

Instead, several bacterial components were detected, and without exception, all these bacteria possessed the function of decomposing organisms to obtain energy. This situation is most common in underground biological communities."

"The most critical point was when dissecting the Bat People's eyeballs. We discovered their visual cortex had degenerated, leaving only traces. Conversely, their hearing was exceptionally developed, similar to bats, with an extremely wide auditory range, especially excellent in the high-frequency ultrasonic range. Their auditory precision far surpassed human levels...."

"Therefore, there is a 95% probability that the other party's location is in an underground, lightless or low-light environment."

Yu Yuan looked at the data information on the screen, listening to Jiu Feng's explanation.

In his mind, he already had a rough understanding of the world where the Moss Cottage Shelter was located.

"An underground world..." Yu Yuan felt amused in his heart.

"What a coincidence this is!"

Source: Webnovel.com, updated by lotustale.com