The arrival of rainbow dragonflies turned the entire Pocratee upside-down just like what happened to Twilight Well.
Caught by surprise, almost all villagers were possessed overnight. The village was home to countless healers who saved many lives in the outside world, yet they couldn't save themselves.
The parasites could survive by absorbing nightmare energy and didn't need to kill their hosts, yet mortal bodies couldn't live long in such a condition. One after one, the residents of Pocratee died off in the following years.
Angor reached the conclusion above by his own assumptions and with the help of body language, or in this case, the "head language" of the giant serpent. There were many details that he couldn't figure out, such as why there were so many corpses that lay along the path that led here. He took many guesses, but none of them were approved by the serpent.