The once spacious and bright living space suddenly felt cramped.

Seeing Todd return, Rachel wiped the sweat from her brow and complained, "This place was just starting to feel like home, and now it's turned into your lab again."

While checking the experimental equipment for its integrity, Todd replied with a smile, "After this battle, I will organize people to build a larger building in the camp, specifically for alien experiments."

Todd took a fine lead box from the wooden crate and said to Rachel, "Remember the Shadow Kingdom? This box contains the poison from back then."

Rachel glanced at the amber stone in the box and took a step back.

“Normally, as long as the box is closed and kept in a cool place, there won’t be any problems.” Todd closed the box.

After setting up the laboratory on the first floor and having a simple lunch, Alfonso and his men arrived at the building entrance.

Todd collected the dragon bone parasites from the Royal Guard Knights into wooden barrels filled with culture medium, and then had Rachel use her "telekinesis" to place the barrels one by one.

Next, Todd prepared all the experimental equipment and began to use the Tyrant to upgrade and modify all the dragon bone parasites.

“In the frigid North, the dragon bones, which prefer warmth, will exhibit reduced activity.” Todd explained as he injected the Tyrant Virus and freezing-powered bacteria into the dragon bones. “This black substance can assemble the cold-resistant genes of the freezing bacteria into the dragon bones. Moreover, it allows the dragon bones to absorb cold air from the outside and then release it through secretory glands to freeze enemies.”

As the black liquid in the syringe gradually entered the parasite's body, Rachel asked curiously, "You know these substances are poisons, won't doing this kill these insects?"

“Interestingly, this black liquid is poison to intelligent beings, but for parasites, it’s the key to evolution.” Todd picked up another bottle of culture medium and pointed to the substance inside, saying, “These are ‘regeneration’ bacteria. Injecting them into the dragon bone along with the black substance can enhance the growth and change speed of the dragon bone without reducing the hardness of the parasites, allowing this biological armor of the dragon bone to transform into various forms.”

After implanting the "enhanced freezing" and "enhanced regeneration" superpower genes into the dragon bone, Todd pointed to a protrusion on the parasite and said, "This parasite is called 'Honeycomb.' It can communicate with its kind in the vicinity by shaking its vocal sacs to send signals."

Rachel nodded: "I've heard a little about the 'Watchtower Massacre,' but I was still shocked when I learned that they could be used as communication tools."

"Although this parasite allows the inheritors to keep in touch with each other, it has two major drawbacks. First, the signals it emits rely on sound waves to be transmitted, making them easy for the enemy to hear and difficult to conceal. Second, the signal strength decreases with distance, and it generally reaches its limit of transmission at around 50 meters."

Todd took out another bottle of culture medium and said excitedly, "But thanks to the discovery of the Tyrant Virus, I have found a solution to the problem. This bottle of culture medium contains 'Sonic Oscillation' bacteria, which can reduce the frequency of sound, allowing the alien species to use sound as a weapon."

Rachel asked with a puzzled look, "I know about this ability too. It can knock enemies unconscious and even shatter human organs. But how does it work with the hive parasite?"

"The enhanced and upgraded 'Sonic Oscillation' ability gene, when installed on the 'Honeycomb Parasite,' can reduce the vibration frequency of the parasite's vocal sacs to about 17 Hz, forming infrasound."

"Infrasound?" Rachel looked completely bewildered.

"Infrasound is also a type of sound wave, but its vibration frequency is less than 20 times per second, which is lower than the frequency of sound waves that the human ear can receive (the human ear can receive sound waves with a frequency of 20 Hz, and those higher than Hz are called ultrasound). Events such as volcanic eruptions, earthquakes, and thunder can all produce infrasound. Although humans cannot hear it, it can cause harm to the human body."

Rachel was puzzled: "If it's sound, how can it cause harm to the body?"

"The frequency of infrasound is very close to the natural frequency of human organs (the natural frequency of human organs is 3 to 17 Hz, for example, the natural frequency of the head is 8 to 12 Hz, and the natural frequency of the abdominal organs is 4 to 6 Hz). When infrasound acts on the human body, human organs are prone to resonance. If the power is large enough, it can also cause dysfunction or even damage to human organs."

"oh……"

The only word to describe the expression on Rachel's face was "bewilderment".

"It has extremely strong penetrating power, a very long transmission distance, and very low energy attenuation. Therefore, it can serve as a tool for transmitting signals over long distances. However, the sonic power of the hive must be controlled within a certain range, otherwise it will create infrasound shocks that will harm the inheritor's body..."

Hearing this, Rachel didn't understand what Todd was saying at all, but that didn't stop her from looking at him with an admiring and ardent gaze.

After a full year of debugging and preparation, the upgrade of the twenty-eight pairs of "Dragon Bone Parasites" was completed.

The gene for freezing makes the keel bones resistant to cold and capable of releasing cold air; the gene for regeneration allows the keel bones to quickly repair themselves and change shape.

As for the "sonic oscillation" ability gene, it completely evolved the sound waves emitted by the hive parasite into infrasound, which not only greatly enhanced the communication distance but also effectively avoided the obstruction of obstacles.