A Patronus was a highly condensed form of positive emotion, and in essence, it was actually quite similar to Non-being.
The difference was that a Patronus came from only one person and normally could not last long, while Non-beings came from a group of people and could endure as long as they received emotional replenishment.
That was why the Patronus Charm could counter Dementors. Non-beings had never lived, so naturally they could not be struck dead by ordinary spells.
But interestingly, the Patronus Charm did not work particularly well against the other two kinds of Non-being. Logically, it should have worked. Even if two emotions were not opposed to each other, they should still have affected one another.
Perhaps they would amplify each other, like surprise and fear. Or perhaps they would dilute each other, like joy and fear.
Manus had once conducted an experiment on a Boggart found in the castle, and the results showed that it could indeed work. However, affecting a Boggart required a sufficiently powerful Patronus Charm.
The Patronus Charm was exceptionally effective against Dementors because of the amplified countering effect. Dementors fed on happiness and were naturally more sensitive to joyful emotions, while a Patronus Charm was highly condensed happiness.
It was like how a person could drink a glass of water, and a glass of water could not drown anyone, but if that glass of water froze into ice, it could kill someone.
That was why the Patronus Charm had such an obvious banishing effect on Dementors and could even make them dissipate.
So, to make it work without that countering relationship, it was like still trying to kill someone with water. The only option was to increase the dosage.
It had long been known that the Patronus Charm was effective against Dementors, and