Many people could not bear the flood of information from the ancient era flooding into their brains. After having nightmares for several days and nights in a row, their spirit index plummeted, their mental state collapsed, and they went insane.
Some people's eyes turned dull, their faces haggard, and their bodies trembled nonstop. Even the faintest light and sound changes would trigger screams and fainting.
There were also some who went crazy and attacked others indiscriminately. They did not know pain and fatigue. Even if they were shackled by spirit shackles, they would still break their own limbs to escape and continue their attacks, they had simply become enhanced versions of zombies.