MTL - First Evolution - v15 Chapter 67 mysterious ancient country

... mulated with realgar, thunder pill and Shijunzi as the main medicine, especially the medicine thunder pill, which is known as the enemy of all insects, and even a rare ancient Parasites, called echo bugs, are terrified.

It is said that in ancient times, there was no cure for this answering insect. Whatever the host said, it would learn a sentence in its stomach. Taking medicine was ineffective, and it consumed a lot of vitality of the host every day, and finally made it weak and died.