The moment the vines touched the mist, Zhang Ling's heart pounded, and he regained feeling in his left arm. He quickly moved it, and the vines on it followed suit. Suddenly, his left arm swelled, and he felt a massive surge of spiritual energy rushing into his body, causing Zhang Ling's expression to change. Looking at the vines on his left arm, they had thickened several times in just a single breath and were still growing wildly. Zhang Ling's face turned red, and he spat out a mouthful of blood. The vine roots that had been embedded in his heart also began to change. Not good! With a thought, he tugged forcefully, and the vines above snapped off at the root. Zhang Ling's face paled further, and his body trembled violently. He was having some trouble breathing. Looking at his left arm, only a few vines remained, and they quickly retreated into his arm. The severed vines, however, continued to grow larger and thicker, pushing Zhang Ling into a corner. Outside, Wei Shen was continuously casting spells to refine the Human Yuan Evil Pill. Looking at the spinning spiritual light cauldron, the spiritual light on it suddenly turned violent. His face darkened, and he quickly cast several spells on it, but to his surprise, not only did it not stabilize, but he also lost control of the spiritual light cauldron. The spiritual light cauldron, floating in mid-air, twisted and became uneven. It could no longer maintain the shape of the cauldron. With a few muffled sounds, several huge vines as thick as buckets suddenly stretched out from it.

"What's going on?" Seeing this scene, Wei Shen's face was gloomy as he thought, "Could it be that the refinement failed?" No, the powerful spiritual energy that had just been emitted appeared suddenly. He looked up at the black and white jade bottles floating on his left and right, and the Yin Fire and Yang Fire within them had been completely consumed. Where did the massive spiritual energy come from just now? Just as Wei Shen was wondering, the spiritual light ball enveloping Zhang Ling made a muffled sound and dissipated into wisps of spiritual light, revealing a huge vine more than twenty feet long before his eyes. The thick vine thrashed wildly, causing the ground to churn with mud and dirt. Wei Shen revealed a look of astonishment and retreated to the edge of the formation. He scanned it with his powerful divine sense, then raised his hand and struck the vine with several beams of spiritual light. Immediately, some blood-colored mysterious runes appeared on the vine. Although he didn't know what this change was, with these runes, he could control this vine. Moreover, the demon beast core that had been released earlier also sensed something in the vine. This scene suggested that the ghost vine parasitizing this kid had undergone a change. Wei Shen spat out a mouthful of green mist-like essence, which transformed into wisps of spiritual light and shot into the thick vine. The blood-colored runes on the vine began to change and wander. After a few breaths, the vine suddenly trembled and stopped moving, but the next moment, the blood-colored runes on it flashed a few times and dimmed slightly, and the vine began to thrash again. "Humph." Wei Shen spat out two more balls of essence, which transformed into spiritual light and shot towards the vine. After about a quarter of an hour, the vine gradually calmed down. At this moment, Wei Shen's face was pale. This series of movements had consumed seventy to eighty percent of his spiritual power, and he had just consumed his essence to control this mutated vine. He was extremely depressed. He scanned the surroundings with his divine sense and couldn't find any trace of Zhang Ling. Could he have been refined? After pondering for a moment, he refocused on the mutated vine. Now, his biggest worry was whether the Human Yuan Evil Pill had really failed to refine. He came to the vine and carefully scanned it with his divine sense. After a while, he flicked his hand, and a spiritual light blade flew out, slashing at one spot on the vine. "It's so hard." Wei Shen revealed a look of surprise. This attack only scratched a shallow crack on the mutated vine. He released three or four more light blades before breaking through the vine's hard skin, revealing a cyan and red sphere wrapped inside. Wei Shen frowned and grabbed the sphere in his hand, sensing the demon core within.

Could this be the Human Yuan Evil Pill? The demon core was originally only the size of a thumb, but now it was covered with a thick layer of keratin, looking neither metal nor wood, and appearing quite strange. He tossed the object into the air and cast several spells on it. A layer of cyan and red light rose from the sphere, and the keratin layer on it flowed strangely. Upon closer inspection, these things were actually tiny vine threads. For a moment, Wei Shen's expression was a mixture of joy and worry, and he became very puzzled. He didn't know if this thing was the Human Yuan Evil Pill, but it did contain the demon core. Wei Shen wrapped a layer of spiritual power around his hand, pinched a vine thread on it, and pulled out a foot-long vine filament. The vine filament separated from the sphere and twisted a few times in his hand before quickly turning black and withering. With a wave of his hand, the vine filament turned into ashes. Then, Wei Shen pointed a finger at the sphere, and all the vine threads on it were torn off by him, revealing the contents inside. Wrapped inside was a small cyan and red bead. As soon as Wei Shen saw this object, he knew it was the demon core. But it was different from before. Not only had the color changed, but several cracks had also appeared on it. Strangely, these cracks were also filled with some cyan and red threads, all of which were vine threads. The difference was that these threads were not like solids, but like spiritual light threads, swimming around the demon core. Wei Shen pointed at one of the threads, as if to pull it out and examine it carefully, but strangely, as soon as his hand reached out, the thread, as if sensing something, shrank and merged into the interior of the demon core, swimming within it. Wei Shen revealed a strange look. This was completely different from the Human Yuan Evil Pill recorded in the classics. While he was carefully studying the sphere, a muffled sound suddenly came from the side. Wei Shen focused his attention. He saw the originally motionless giant vine suddenly shake a few times. Without thinking too much, he quickly shot backwards. At the same time, several soft sounds came from behind him, and Wei Shen suddenly felt a chill rise up his back. He was currently in mid-air, retreating rapidly, and had no time to turn around. He quickly circulated the spiritual power in his body, but it was already too late. A tiny flying needle flashed and shot out from the center of his forehead. With a clang, it hit the ground next to him. Wei Shen's face was dull, and his body still maintained the posture of retreating. His eyes also lost their luster, and his body stumbled back a few steps before falling to the ground. "Finally dead, cough cough." Two soft coughs came from not far away. Zhang Ling gasped heavily for a few breaths, his body swayed, and he collapsed to the ground.