"According to his symptoms, he's most likely been poisoned with a powder made from the extract of the sap leaves of a tropical tree called the poison arrow tree.
"Its effect is to paralyze the heart, coagulate blood, seal blood vessels, and finally suffocate a person to death. Its toxicity is even more potent than that of a five-paced viper.
"As long as it touches you briefly, it can kill you."
Gu Chengrui had just finished speaking when the old man twitched violently and kicked his leg out.
The way the two died was similar, but one was fast, and the other was slower.
"It seems that the poison they were poisoned with came from the poison arrow tree, but in different forms."
The Third Prince asked thoughtfully, "You mean this thing comes from the tropics? What do you mean by tropics?"
"The tropics are places that are very hot all year round. For example, the south of the Ming Dynasty is especially hot and humid."
