Chen Feng's mental attacks surged like a tidal wave, each impact causing Green Toad's body to tremble uncontrollably.

Its eyes began to blur, its vision becoming indistinct. Terrifying images kept flashing through its mind, making it impossible for it to concentrate.

In this moment of despair, a strong will to survive surged within the green toad. It used its last bit of strength to try to escape from the cave.

However, its body had completely lost control, and it could only struggle in place.

Chen Feng concentrated his mind, gathering all his spiritual power at his fingertips to form a slave seal that shone with a mysterious light.

He carefully brought the slave seal close to Green Toad's forehead, then gently touched it. The slave seal shot into Green Toad's mind like a shooting star.

However, the green toad's subconscious mind displayed an astonishing power of resistance. A storm seemed to rage within its mind, as it fiercely battled the slave mark.

Chen Feng gritted his teeth, sweat pouring down his forehead. He did his best to maintain the power of the slave seal, but the green toad's resistance grew stronger and stronger.

An hour passed, and the slave seal was finally broken by the green toad's tenacious resistance. Chen Feng felt a pang of disappointment, but he did not give up.

He took a deep breath, composed himself, and once again condensed a new slave seal. This time, he was even more focused, infusing his will into the slave seal to make it even more powerful.

Time passed second by second, and Chen Feng's face grew paler and paler, but his eyes remained firm.

Finally, half an hour later, the slave seal successfully broke through the green toad's defenses and embedded itself deeply into its mind. The green toad's body trembled violently, and then its eyes became docile and submissive.