Upgrade of Concealment and Invisibility Device

Despite its impressive-sounding name, the concealment and stealth devices installed at the time could only block radar scans and could not achieve optical stealth.

For this reason, Dong Qi did not upgrade the concealment device after it was installed, and even when there was spare metal material later, he did not think of the device.

Regardless of what happened back then, now, because of the transformation of the natal vehicle into the Starfire Flying Boat, the originally low-potential, purely technological concealment and stealth device has received a significant boost because it can absorb similar spiritual items and upgrade infinitely.

Dong Qi had previously seen many similar exchange items on the exchange list at the military supply department.

From the simplest electromagnetic invisibility barrier to slightly more advanced optical camouflage curtains, even the mist array disk (without energy) that looks like it was brought over by other transmigrators and has become a unique item, or even a subspace transfer device (without energy), the exchange interface offers a wide variety of similar products.

However, it used to take tens of millions of contribution points to exchange for those items, but Dong Qi has already applied for an automatic upgrade of his military rank.

Therefore, although Dong Qi had seen those things, he didn't care too much because they weren't necessities. He was somewhat eager for them, but not overly concerned.

But Dong Qi never expected that the Starfire Flying Boat would be so efficient in killing enemies, and that his military rank would rise so quickly.

Not to mention that during this period, the Starfire Flying Boat was also successfully upgraded, which made the exchange items that were originally thought to be out of reach now somewhat within reach.

However, while the concealment and stealth devices can be upgraded indefinitely, the equipment grade must be gradually increased level by level.

Therefore, to upgrade the subspace transfer device, it is necessary to absorb similar devices of different levels in the early stages.

However, Dong Qi still needs to spend a considerable amount of contribution points to exchange for these devices.

However, having figured out the Starfire Flying Boat's killing efficiency over the past few days, Dong Qi can roughly estimate how long it will take to collect contribution points in order to exchange for those items, barring any unforeseen circumstances.

Normally, giant White Walkers would join the battle between five and fifteen days after the war began; the later they joined, the longer the war would last.

Including today, Dong Qi has been fighting outside the city for about ten days. Therefore, any experienced veteran at the front fortress knows that this is going to be a very long and bitter battle.

That's why experienced combat personnel paid close attention to Dong Qi's Starfire Flying Boat.

Although there are many underground buildings in the forward fortress, especially the parking lot, which has several underground levels.

The fact that they retreated to underground spaces indicates that the frontline fortresses of this war were on the verge of collapse and had already become occupied areas.

Furthermore, compared to the underground space where there was no way to retreat, most of the participants, whether they were transmigrators or native inhabitants, would rather endure the punishment than retreat to the underground space, and instead choose to desperately break through.

Therefore, solid fortresses on the ground were their preferred choice. In order to ensure that Dong Qi and the other transmigrators could fight to the last drop of their strength in the war, the natives here used materials that were far inferior to those used in the inner city when building the outer city of the fortress.

Dong Qi, who had just arrived, was unaware of the intricacies of the situation, and was therefore somewhat puzzled when he noticed many people glancing at the Starfire Flying Boat from time to time.

In fact, if the outer city fell, Dong Qi could have easily stored the Starfire Flying Boat in his sea of ​​consciousness. After all, the Starfire Flying Boat's enormous size would make it an obvious target if it weren't properly concealed.

When the city gates reopened, the participants breathed a sigh of relief when they saw the Starfire Ship, which had been deep in the army of the Others, return to the city gates.

After all, they have rotated countless times, and every time they participate in the battle, the Starfire Flying Boat can be seen in the same position without changing.

Therefore, his attitude towards the Starfire Flying Boat changed from admiration at the beginning to jealousy in the middle, and finally his attitude towards the Starfire Flying Boat became very complicated.

On one hand, they hoped that the Starfire Airship would return to the city as soon as possible for resupply, so that the gap between them and the owners of the Starfire Airship would not be too large.

On the other hand, it is hoped that the Starfire Ships can hold out longer among the White Walker army, so that when the outer city falls, the Starfire Ships can help them leave the front line fortress more safely.

These people never even considered whether Dong Qi would allow them to board the Starfire Flying Ship if the outer city fell.

When Dong Qi returned the Starfire Flying Boat to his sea of ​​consciousness and entered the city, he found that the atmosphere inside the fortress was much more subdued than when the war had just begun.

Along the way, Dong Qi never saw anyone strolling leisurely like before. All the pedestrians he saw on the street looked hurried.

Therefore, Dong Qi did not linger on the road and went directly to the military supply depot.

When Dong Qi arrived at the military supply depot, he found that it had become quite lively compared to its previous quiet state.

It's important to know that most redeemable items can actually be done online, without needing to be redeemed in person.

Upon seeing an empty seat, Dong Qi immediately walked over, inserted his ID card, opened the exchange interface, and began to check the items he needed.

The concealment and cloaking device installed on the Starfire Flying Boat at this time, despite its impressive-sounding name, is actually just the lowest-tier gray-quality equipment.

To improve its quality, similar to how you improved the quality of your original car, you need to absorb higher quality items of the same type.

This means that Dong Qi needs to find similar equipment of white quality first.

To be honest, there aren't many low-quality similar equipment items in the exchange interface. After all, given the intensity of the war at the front fortress, white-quality stealth devices aren't really that useful against the White Walkers.

After much deliberation, Dong Qi finally realized that there weren't many equipment options available, so he had no choice but to select the Mist Array Plate (which has no energy).

The Mist Array Plate is an item belonging to cultivators. Once activated, it can cause dense fog to cover the area it covers, extending outwards by up to five meters.

Dense fog is simply water vapor; it has no other additional effects and can only serve to obstruct vision.

Perhaps because it is a dense fog of water vapor, it can also barely block the spread of odors in the fog.

Items like the Mist Array Disc, which are clearly not native products, are obviously personal items brought by time travelers. These kinds of items are basically unique.

Since it has been determined that the native humans can no longer use these items, the exchange price for them is not very high.

Dong Qi certainly didn't have the spirit stones needed to activate the Mist Array Plate, but he possessed the Eternal Treasure Furnace, which could provide corresponding energy for various items. As for mainstream energy like spiritual energy, the Eternal Treasure Furnace could naturally provide it with power.

After absorbing the mist array, the concealment and cloaking device gained an additional function: releasing mist, in addition to its original function.

This function isn't very practical in actual combat; it can only generate a fog cover layer about five meters long around the Starfire Flying Boat.

It can only simply conceal sight and smell, but cannot conceal other investigative methods.

After the concealment device and the fog absorption array disk's quality are upgraded from gray to white.

Next, Dong Qi needs to select green items, which are the nutrients needed for the next grade promotion.

Compared to the scarce white items, the higher-quality green items are actually more numerous.

Compared to the swift and decisive selection just now, the increased number of items actually made it more difficult for Dong Qi to choose.

After careful consideration, we finally chose the optical camouflage device. The principle behind this device is quite complex, but simply put, once activated, it can achieve visual invisibility.

After the concealment and camouflage equipment was integrated with the optical camouflage device, it was successfully upgraded to green quality.

When Dong Qi wanted to advance to the next level, he couldn't find any blue-quality equipment.

When Dong Qi first learned of this situation, he was quite disappointed.

To Dong Qi's surprise, the exchange list contained neither blue nor purple quality equipment.

But Dong Qi never expected that the exchange interface would skip the silver equipment and instead have a gold equipment that no one had exchanged.

That was the subspace transfer device that Dong Qi had seen before. The device's function was very simple: to open a subspace portal at a fixed location.

There is no limit to how long items sent into the subspace can be stored in the subspace memory.

However, the subspace is like a multi-layered, public parallel space, not a private space. Therefore, it is not very useful to use it as a warehouse.

There is another rather troublesome thing, namely the subspace transfer device. Although it is quite large, it is indeed a movable object.

However, once the subspace transfer device is moved, the next subspace to be opened will not necessarily be the same subspace as the last one.

Although the subspace is a public space, no one knows exactly how many layers it has.

This is why, although the subspace transfer device can be moved freely, once it is used, it cannot be moved at will; otherwise, it would be very difficult to retrieve the items that were previously sent into the subspace.

Most importantly, the energy consumed by the subspace transfer device is not common electricity, nor the various spirit stones of the magic side, but a very special energy crystal from the fantasy side.

Each time the subspace transfer device is activated and the subspace gate is opened, the energy consumed is enormous.

This is why, after only a few attempts, all the energy remaining in the device was exhausted. At this point, the subspace transfer device, which had no energy to activate, was more of a commemorative item than a practical one.

Although he had never tried it directly, Dong Qi felt that the Yongzhen Furnace was definitely capable of activating the subspace transfer device.

Perhaps because no one has redeemed it for a long time, the redemption price of this gold-quality item is not as high as Dong Qi had imagined.

But when Dong Qi actually exchanged it, he was unaware that his exchange had alarmed the military logistics headquarters located in the rear of humanity.

"Sir, someone has redeemed the subspace transfer device."

Upon hearing his subordinate's report, the man's face lit up with joy at first, but then he said with a hint of helplessness, "Let's hope this time it's for real, and not like before, where after exchanging them we found no one was using them and we had to resell them."

Hearing his boss muttering to himself, the subordinate didn't pay much attention. However, seeing that his boss seemed about to drift into a reverie, the subordinate felt compelled to speak up: "Should we send him the real thing or a fake this time?"

Items that can appear on the exchange list at the military supply depot, and are special items brought over by time travelers.

The natives will inevitably conduct research on it first. Even if the item has run out of energy and can no longer be used, those resourceful researchers can still conduct limited research on it without damaging the device.

The most important of these is to create an instrument that mimics the absorption and subspace transfer device to absorb the same energy.

Such special devices should not appear on the redemption list at all, according to common sense.

The reason it's currently on the redemption list, and the price isn't high, is actually to lure people in with a bait-and-switch tactic.

This thing is very large. If an ordinary person happens to buy it by sheer luck and finds that it is unusable, someone will come to their door and buy it back at a low price.

Some people, after being cheated or taken advantage of, want to smash the object directly. It sounds nice, but the actual possibility is not high.

After all, a device capable of opening a spatial barrier must be made of highly resistant materials, so there is no need to worry too much about its safety.

That's why, not long after, the equipment that Dong Qi was given was indeed the original equipment, not a counterfeit.