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Wolf's tail grass was a poisonous herb. It was extremely poisonous. If an ordinary person was fed with a Wolf's tail grass, he would be poisoned to death in less than two minutes. After he died, a blue mark would appear on his chest. The mark would look like a wolf's tail. It was because of this that this grass had its name.
This kind of wolf tail grass was definitely not a good thing for ordinary cultivators, especially those that were more than three years old. The toxicity of wolf tail grass that was more than three years old was even greater. Ordinary cultivators would not even dare to touch it.