What Is Poisonous Spiritual Energy?

Chen Changgeng traveled through time. There is neither a slap in the face from the system, nor a dream from an old man, nor even a standard time-travel opening about near-death. It is just so ordinary that as soon as you open and close your eyes, you fall into a modern city where immortals are in power. He was not high-spirited, and had never thought about conquering the heavens with his enlightenment against heaven, so he planned to practice according to the exercises honestly, and live without worries about food and clothing. One day, when the opportunity came, he could return to the earth and take a look. Even if it was not a loss, it would be better if his parents did not become a handful of loess. Unfortunately, the opposite happened. After practicing steadily for half a year, my cultivation is as stable as an old dog, without any progress. Chen Changgeng also calmly accepted the useless setting. At worst, he would just lie down and live out his life. It wasn't until he saw the broken scroll that he realized something was wrong. Is my cultivation path fundamentally wrong? Also, what does it mean that the aura of this world... Is poisonous? !