One consequence could be that the wizarding world is in shock. Dementors are usually just sent away or repelled, not killed. So, the Ministry of Magic might be very concerned about this new development and start to investigate Harry.
On a more personal level for Harry, he might face a lot of mixed reactions from his friends and teachers. Some might see him as a hero for getting rid of such dangerous creatures, but others might be worried that he has overstepped some unwritten magical boundaries. His actions could also put him in the crosshairs of dark wizards who were using the dementors for their own purposes. They might see Harry as a threat and try to retaliate against him.
The death of the dementors could have an impact on the Azkaban prison. Since dementors are the guards there, their absence might lead to a security crisis. Some of the more dangerous prisoners could try to escape without the fear - inducing presence of the dementors. Also, the balance of dark and light magic in the area around Azkaban could be disrupted. It might attract other dark creatures or cause some strange magical phenomena.
Well, it could be that in this fanfic, Harry has some sort of special artifact or weapon. For example, he might find an ancient magical object that has the power to vanquish dementors. He figures out how to use it and thus is able to kill the dementors. It could also be that he has made a special connection with some magical being or force that gives him the strength to take on the dementors in a more lethal way.
One consequence could be that the wizarding world starts to view him with even more suspicion and fear. People are already afraid of dementors, and if Harry can control them, they might think he's becoming too powerful or even turning to the dark side.
In many fanfictions, Dementors are used as a tool to create a sense of despair. For example, when a character is facing a Dementor, their worst memories are brought to the surface, and this can be used to develop the character further. The fanfictions might also show how different characters react to the Dementors in different ways. Some might be paralyzed with fear, while others might try to fight back using magic like the Patronus charm.
It could also be due to his own inner strength and growth as a wizard. Harry has faced so many challenges and traumas throughout his life. His experiences might have awakened a latent power within him that allows him to control dementors. His strong willpower and determination, which have been developed over years of fighting against the dark forces, could be the key factor in this newfound ability.
Well, in some fanfictions, Harry might use a super - powered Patronus. His Patronus could be stronger than usual, perhaps due to some newfound magic or a special connection he has developed. It could be so powerful that it simply overpowers the dementors and destroys them.
One way is through group support. If characters are together, they can draw strength from each other. For example, Hermione could use her knowledge to come up with a plan. Ron could offer his loyalty and courage. And they could all hold hands and face the Dementors together. Also, they might find some magical artifacts that can help, like a special amulet that gives them a sense of calm when Dementors are near.
It's often described as an icy - cold and terrifying experience. The Dementors are usually depicted as hovering over the female Harry Potter character, their hooded forms menacing. The Kiss itself might be described as a sort of draining sensation, like all the warmth and hope being sucked out of her.
One possible consequence is that the wizarding world might see Harry as a hero even more than before. After all, dementors are very dangerous creatures, and if he manages to destroy them, it's a huge accomplishment.
There are a vast number of fanfictions in the Harry Potter fandom, and it's quite possible that there is one where Harry Potter kills dementors. FanFiction.net has a huge collection of Harry Potter - related fanfictions. Another option is to check out Wattpad, although it has a more diverse range of stories including non - HP specific ones. When you search, make sure to be as specific as possible in your search terms to increase your chances of finding the relevant fanfiction.
Well, it could change the plot in many ways. For example, he might be able to negotiate with them. Maybe he can convince them not to attack people, which would make Hogwarts a much safer place. He could also learn more about their origin and motives directly from them, instead of just speculating as others do.