After Lin Feng's squad left, the main force of the Salvation Army, under the leadership of Bai Ye, successfully escaped to the stairway leading to the surface cave.

The faint sunlight spilling in from outside the cave was neither hot nor bright, yet it became a terrifying ray that the mutants dreaded.

The scorching sunlight from Three Days in the Sky, after shining into the cave, only retained one-tenth of its original brightness.

But for the mutants below the relic's negative fourth level, it was as unbearable as facing the Sun directly.

So when the squad members stepped onto the staircase, the mutants rushing from behind hurriedly braked, stopping outside the beam of light at the cave entrance.

From afar, a group of mutated monsters stood in the gloomy shadows, gathering outside the shaft of tilted light, staring intently at the humans climbing the stairs.

Like demons from hell, begrudgingly watching human souls ascend to heaven.

A few Tier One mutants tentatively stretched out an arm to test.

Their arms, wrapped in mucus, were quickly scalded by the light, which was only around thirty degrees, emitting a white mist, and the mutated cells in the mucus died tragically under the sunlight exposure.

With the tearing pain coming from the arm, this young mutant was about to pay a heavy price for its ignorant actions.

By the time it withdrew its arm, the radiation from ultraviolet rays had already damaged the mucous membrane on the skin surface and continued to invade the flesh and bones.

Sunlight's rays were like thousands of fine needles, piercing the biological membrane of mutant cells, smashing the already fragile spliced chromosomes inside like a particle stream.

Leading to a fundamental death of the cell.

Ultimately, the cellular structure of the entire arm ruptured and decayed under sunlight radiation, becoming a pool of grayish-white blood, spilling on the ground.

A hoarse sound of painful hissing emanated from its mouth, but not much time was left for it, as its now weakened self, having lost an arm, had already been eyed by other mutants.

Now, without catching enough prey, other food would have to replenish the long chase's consumption, such as an injured fellow mutant.

But most of the mutants still kept their eyes on the live humans climbing the stairs with difficulty.

They were the delicacies they craved.

Members of the Salvation Army squad, especially the main force from the underground negative sixth level, had fled to this point, covering a distance of nearly fifty-five kilometers.

Farther than a marathon.

Aside from leader Bai Ye, others carried burdens no lighter than Lin Feng's squad in their battle armor.

And even with this, sprinting more than fifty kilometers in one breath, even with late Tier One evolutionary power, they had long exhausted their strength, already a spent force.

If not for that mysterious person at the cave entrance, who came to their aid just in time in the nick of time...

Right now, at least half of the Salvation Army members would have been caught by the powerful mutants from behind, eventually buried in this flood-like wave of monsters.

Luckily, at this moment, they had already reached the cave entrance, basking in the long-lost warm sunlight.

Leader Bai Ye stood at the negative first level cave entrance, extending a hand to help a teammate over the last step into the surface cave.

She looked down to see the ignorant mutant injured by sunlight, losing an arm instantly.

She also saw the powerful Tier Two mutants, the Corruptors, and at the forefront, that nearly four-meter-high Tier Three mutant, stopping in front of the light beam at the staircase entrance, halted altogether.

Although it was composed of already-polluted Tier Three cells, its highly evolved self possessed a certain amount of intelligence, well aware of the lethal power of external sunlight on them, the monsters born from darkness and pollution.

So this Tier Three Distortion King merely stood at the edge where the light beam fell, lifting its gaze using the newly grown tender buds on its face and body; the end buds split open to form photoreceptive eyeballs, staring intently at the departing humans.

Especially the most powerful silver-haired female among them.

Bai Ye slightly lowered her eyes, borrowing a small round mirror from a female teammate.

Then, using light refraction, she reflected the light from the cave entrance onto the Tier Three mutant.

The result was the same as the previous test; the sunlight from the mirror penetrated the darkness, burning a patch of grayish-white smoke on its body, hissing in the process.

Yet the Tier Three Distortion King remained unmoved, seemingly wanting to test its tolerance towards external sunlight.

Unfortunately, the fear originating from pollutant genes overwhelmed its preliminary formed self-awareness in the brain...

After enduring for more than ten seconds, it finally retreated.

The Tier Three Distortion King emitted a howl similar to a wolf, tinged with a human-like screaming roar, turned, and ran back into the depths of the relic where it came from.

Leaving behind only a fist-sized crater-like deep pit burnt on its body, which, after leaving the sunlight exposure, quickly proliferated to heal into a round black scarred lump, thanks to the robust life force of Tier Three pollutant cells.

Bai Ye intended to adjust the angle and continue the projection.

But unfortunately, the weak sunlight refracted was greatly diminished in brightness due to scattering from going further, plus the absorption by the dark environment, moisture from vapor droplets in the humid air deep within the relic, and so on...

So, after over a hundred meters, the light diminished to an invisible degree, naturally having no lethality on the mutants.

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