"Buzz—"

As a low buzzing sound rang out, Gray Sea suddenly felt a splitting headache, as if a million steel needles were churning inside his brain.

The excruciating pain was unbearable for him; he clutched his head, rolled on the ground, and screamed, trying to alleviate the agony.

However, Chen Feng's mental attacks came relentlessly, wave after wave, mercilessly ravaging Gray Sea's consciousness.

Gradually, Gray Sea's struggles became increasingly powerless, and his roars gradually weakened until he could only lie on the ground like a dying fish, panting heavily.

Looking at the battered and exhausted Gray Sea before him, Chen Feng couldn't help but feel a surge of joy.

Gray Sea was covered in hideous wounds, with blood gushing out and staining large areas of the land red; his eyes were also glazed and unfocused, clearly indicating that he had suffered great psychological trauma.

Knowing that the opportunity was too good to pass up, Chen Feng immediately used a mysterious technique to strike a slave seal that emitted an eerie light into Gray Sea's mind.

The slave seal swiftly entered Gray Sea's head like a bolt of lightning, and then began to frantically suppress Gray Sea's consciousness.

In an instant, an indescribable pain swept over him, and Gray Sea felt as if his head was about to explode.

The physical pain was already unbearable for him, but the sudden mental torment only made things worse.

The double pain intertwined, like sharp knives ravaging and cutting inside his body, causing him to writhe involuntarily.

"howl--"

Grey Sea opened its mouth and let out a series of extremely shrill screams.

The sound resounded through the sky, startling the surrounding birds and beasts into scattering and fleeing.

However, no matter how much he struggled and resisted, he could not break free from the bondage and suppression of that slave mark.

As time passed, Gray Sea's movements gradually became sluggish and weak, and its cries grew fainter and fainter.

Finally, after a period of agonizing torment, his body slowly stopped moving and became completely still.

At this moment, the slave mark had been deeply embedded in the depths of his consciousness, leaving an indelible spiritual imprint.

Gray Sea said respectfully, "Gray Sea greets Master."

At this moment, his eyes were filled with awe and obedience, clearly indicating that he had been completely enslaved by Chen Feng.

Just then, seeing that his goal had been achieved, Chen Feng slowly stopped the powerful mental attack he was launching on Gray Sea.

Despite enduring immense physical pain after suffering such a severe mental shock, Gray Sea managed to struggle to his feet.

His movements appeared somewhat clumsy and labored, as if every slight movement would aggravate his injuries.

In the end, Hui Hai knelt down and paid homage to Chen Feng in front of him, his posture extremely humble.

Looking at the obedient Gray Sea before him, Chen Feng nodded in satisfaction and said softly, "Very good. From now on, you will stay by my side."

After saying that, he reached into his pocket and took out some precious healing medicines, then handed them to Hui Hai, and said, "These are medicines that can treat your injuries. You should treat your wounds yourself first."

These healing medicines emitted a faint fragrance, clearly indicating their high value.