One consequence could be the emergence of new power structures. Those who can harness the returning magic might gain political or social influence. For example, a group of young wizards could form a new council to oversee the use of magic. Another consequence is the change in the natural environment. Magical creatures might return, like unicorns and dragons, which could disrupt the existing ecosystem. Also, the cultural identity of Britain in the novel would be transformed as magic becomes an integral part of daily life, with new festivals and traditions related to magic emerging.
Magic could return to Britain in the fantasy novel because of a shift in the magical ley lines. These are like energy channels for magic in the world of fantasy. If there is a significant cosmological event, such as an alignment of stars or a change in the flow of magical energy from other dimensions, it might cause the ley lines in Britain to start flowing with magic again. This would lead to the return of magic in various forms, from the ability of people to perform spells to the appearance of magical creatures that were once thought extinct.
There could be personal consequences for Harry as well. He might face opposition and even threats from those who want to protect the status quo in Magical Britain. His friends and family could also be affected, either by being targeted or by being caught in the middle of the conflict between Harry and the establishment. However, this could also make him more determined to fight for what he believes is right.
In some fictions, not returning a book might lead to a fine. For example, in a story set in a strict library system in a magical world, if you don't return the book on time, you could be magically locked out of all libraries. It could also damage your reputation among the librarian community, who might spread the word and make it difficult for you to borrow books in the future.
It should have unique and imaginative magic systems. Also, the characters and their development need to be compelling and stand out.
Fantasy novels often present America as a land of opportunity in a different way compared to Britain. American characters might be more likely to be self - made heroes, rising from humble beginnings. They could be associated with modern - ish concepts even in a fantasy setting, like new forms of magic or technology. Britain in fantasy novels may draw more on its rich history of folklore and mythology. Its characters could be knights or mages with a connection to ancient orders. There's also a certain elegance and formality to British - inspired settings and characters that you don't always find in the more rough - and - tumble American - inspired fantasy elements.
One possible consequence could be that the healer accidentally harms the patient instead of curing them. For example, if the magic is misdirected, it might cause internal damage or make the illness worse.
Well, usually it leads to chaos and unexpected problems for the characters. Sometimes it even puts them in serious danger.