The gate of life and death!

After entering the secret cave, ye chen continued to move forward. He did not care about the people behind him at all. He also did not care about the demon dweller who was cooperating with him. What he wanted was to find out the truth of this secret cave as soon as possible.

"Which expert is able to create such a secret cave where both Immortals and demons are present?"

Ye chen began to think. He quickly recalled his own experience.

He believed that this expert had to have lived both lives as a demon and as a human, or perhaps even had achieved outstanding results in both lives, finally being able to create such an exquisite formation cave.

This was the trial ground of the immortal and demon clans. From the design, it could even be seen that the two clans had to help each other in order to carry out certain operations. Was there some hidden message in this?