One way could be through meditation. In fanfiction, Harry might have learned some advanced meditation techniques from the Hogwarts library or from a mysterious wizard. By meditating, he can clear his mind and create a mental shield against nightmares.
Well, it could be that Harry Potter in fanfiction controls nightmares by tapping into his inner strength. Since he has faced so many dark and terrifying things in his life, he might have developed a mental resilience. He could use this mental strength to enter the dream world consciously and change the nightmare scenarios, just like he faces his real - life enemies.
Another way is by merging different types of magic. He could combine his own Gryffindor - like courage - based magic with the more calculating magic of Ravenclaw. This would give him a new and more versatile way to control magic, allowing him to solve problems in different ways than in the original story.
Another way is through his connection with his friends. In fanfic, they might form a powerful bond that gives him the ability to control darkness. For instance, Hermione's knowledge and Ron's loyalty could combine with Harry's power in a unique way, allowing him to manage the dark elements. It's like they create a force field of positive energy together that can counter and control the darkness.
Harry might assist in retrieving lost or stolen items. His bravery and problem - solving abilities could come in handy. If a valuable magical artifact was taken from Gringotts, Harry could lead a quest to get it back. He has a knack for getting into and out of difficult situations, which would be useful in such a task.
One way is through distraction. The snake could draw the attention of Harry's attackers away from him. It could slither towards the bad guys and make menacing hisses, causing them to focus on the snake instead of Harry.
It could be that Dumbledore is afraid of what Harry might do if left to his own devices. Harry has a lot of power, and Dumbledore may worry that he could be swayed by the wrong people or ideas. So, in an attempt to keep Harry on the 'right path', he resorts to trying to control him. But this also shows a lack of faith in Harry's character and judgment.
He could use it to unlock metal locks without a key. Just by using his magnetism control, he can manipulate the tumblers inside the lock.
One possible consequence is that the wizarding world would be in a state of confusion. The traditional boundaries between good and bad would be blurred, and many wizards might not know how to react. Some might fear Harry's new - found power over the Dark.
Snape might simply sit with Harry in silence for a while. Just his presence could be reassuring to Harry. After some time, Snape could start a conversation, asking Harry what is wrong in a more empathetic tone than usual. This gradual approach could help Harry calm down.
One plotline could be that she uses her reality - controlling power to rewrite the history of the wizarding world. Maybe she changes the outcome of the first wizarding war to prevent the rise of Voldemort in the first place.