In this chapter, we learn that the poison from the Seven Absolute Jade Phosphorus Flower has a weakness, which means that even if the poison is so strong, it will still have a weakness. In other words, even if it is the strongest poison on the face of the earth, the poison will still be weaker than the rest of the plants in the world because it is made up of many different kinds of plants. So, even though the poison might be the strongest, it is still weaker than other plants because it contains so many different types of plants and because it has so many kinds of impurities. This is why, when the poison reaches the "absolute ice domain" , it can only be broken down into smaller pieces. The poison will not be able to penetrate the ice domain, so the poison can be broken up into smaller parts. The ice domain will then be broken apart, allowing the poison to enter the body and kill the person it is meant to kill.