The Pagoda has been associated with the eradicator of Demons because it harnesses the power of lighting.
Pagodas were primarily constructed as places to practice Meditation. They were built high into the sky in order to reach heaven. Since they were so high, lightning would strike the top causing the pagoda to be associated with having the power to eradicate evil spirits.
This has also been associated with the Lighting Fast understanding of
The Dragon Phenomenon.
Using a replica pagoda, the user will be reminded to eradicate the demons within the self.