With the Level 18 Evolution Potion, Lin Feng quickly returned to the camp outside the cave.

This Evolution Agent, nearly reaching over 300 milliliters, contains rich Source Material and originates from the Evolutionary Meat of a Leader Level Rock-Horned Horse.

If divided equally into two parts, it can become two Level 17 Evolution Agents.

It can allow two Mid-Tier One Evolvers to achieve Late Stage Evolution.

But only by first ensuring his own Evolution Level improvement can he bring the maximum benefit.

After all, the core combat power of the team isn't even Lin Feng himself, but rather the two upgraded guns whose firepower far surpasses that of the same Tier Gunpowder Ability Users.

With the Evolution Agent in hand, he went into the vehicle. At this time, the previously Level 9 Purification Extraction Filter had been upgraded to Level 10:

"Nanometer-Level Source Filter Level 10, Red Quality, Brand"

"Basic Attributes: Maximum aperture 90 nanometers, Tier One Gene Impurity Filtering Degree: 100%; Usable times 1; Can consume five points of Life Value to upgrade"

"Evaluation: Can perfectly filter alien gene impurities from Tier One Life Source Material to obtain Pure Source Material, achieving Purity Evolution; Limited in filtering ability for Tier Two Life Source Material, requiring a maximum aperture no greater than 10 nanometers to achieve thorough impurity filtration"

Lin Feng squinted his eyes, then poured the Life Source Material from the Evolution Agent into the Nanometer-Level Filter to filter out all the Rock-Horned Horse gene fragments.

After obtaining a portion of pure Level 18 Life Source Material, he then upgraded the filter, saving one point of Life Value to refresh the usage count.

According to the calculation of a 10-nanometer decrease in aperture each time, it would need to be upgraded to Level 18 to effectively filter the impurities in Tier Two Source Material.

Ten levels later, when Lin Feng absorbs the Rock-Horned Horse Tier Two Life Source Material, he must use the Level 18 filter to achieve Purity Evolution.

As for the current Level 18 Evolution Agent, even if taken directly, it won't have much impact on the body because Lin Feng himself is already a Tier One Evolver, and his Tier One Evolutionary Cells can handle incoming cells of the same tier and avoid gene contamination.

But for the sake of safety, Lin Feng always uses filtered Pure Source Material for each evolution. After all, it takes only one point of Life Value to restore durability and refresh usage counts, making the cost nearly zero.

After collecting the Pure Source Material, Lin Feng first ate a piece of Level 18 Evolutionary Dried Meat to recover his state, then drank a big cup of Life Source Material that had been filtered.

Gulp, gulp...

A warm current spread from the stomach throughout his body.

It gave Lin Feng a sensation of sinking his energy into his dantian, circulating throughout his body like Spiritual Qi was flowing.

But in reality, it was the large amount of Level 16 cells in his body, stimulated by the Level 18 Source Material, starting to divide and proliferate, evolving to Level 17.

The core Level 17 Evolutionary Cells fully absorbed the source material, transforming into Level 18.

By extrapolation, it promotes the evolution of the entire body.

After a short period of rest with eyes closed, Lin Feng smoothly completed the transformation, becoming a powerful Level 18 Evolver:

"Lin Feng, Level 18/19"

"Life Value: 140, Physique: 140, Spirit: 139; Level 18 attribute upper limit 140"

"Superpower Awakening: Power of Branding (small enhancement to equipment upgrade speed)"

"Item upgrade upper limit increased to Level 18!"

"Can consume 5 Life Value points to continue upgrading Level 17 Machine Cannon Gun, Level 17 Rapid Fire Cannon, Level 11 Source Filter"

This evolution took less than half an hour.

The main reason is that the small-level evolution within the stage did not bring much improvement, it just laid a more solid foundation for later evolution, while the power upper limit broke through to eight tons, further advancing overall strength.

After completing everything, Lin Feng immediately upgraded the Level 17 Armor-Piercing Cannon and Rapid Fire Cannon beside him.

Spending ten points of Life Value all at once, his body somewhat weakened in its prosperous state just after evolution.

Lin Feng hurriedly ate half a piece of Level 18 Evolutionary Meat.

Each piece of Level 18 Evolutionary Meat is a standard kilogram, capable of restoring twenty Life Value points, half a piece being half a kilo, just enough to replenish the ten points consumed in the upgrade.

The urgency in upgrading comes mainly from the imminent battle with Mutants, which urgently requires combat power enhancement, plus Lin Feng's evolution requires that the disguise of the firearms superpower be strengthened to fit his persona and avoid suspicion from the Salvation Army.

Of course, the Level 11 Source Filter also needs to continue upgrading.

And as Lin Feng expected, with each subsequent upgrade, the maximum aperture of the filter core decreases by ten nanometers.

By extrapolation, upon reaching Level 18, it can filter the Tier Two Life Source Material of the Clan Leader Level Rock-Horned Horses.

The urgency of Lin Feng in upgrading the filter, besides the need to purify the Tier Two Source Material, also stems from a deep-seated thought within him:

That is whether the Evolutionary Meat of the Tier Three Distortion King can extract what's called Tier Three Source Material?!

If so, even if Lin Feng doesn't need it now, the next time he passes through the Taishan Ruins, a wasteland year after the Global Migration, he will surely need it.

Given Lin Feng's current evolution speed, it's certain that within six years, he will advance to Late Tier Two. By then, like Bai Ye, he should consider advancing to Tier Three and establishing his own King's City.

And if the Tier Three Pollution Source in the Taishan Ruins can aid in Lin Feng's advancement to Tier Three, the value of the Source Filter in his hands...

It's not something that can be simply measured by Points!

Even a few million or tens of millions of Points can't compare to the influence of a Tier Three King.

Even if Lin Feng can't use it now, just getting even a little bit of Tier Three Source Material can become one of his biggest trump cards in the future.

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