One way could be through a time - travel plot. Imagine an immortal character from the Harry Potter world travels back in time to prevent the nuclear war from starting. They could use magic to influence key historical events or people involved in the development of nuclear weapons. Another possibility is that the nuclear war is a result of dark magic experiments gone wrong that leaked into the Muggle world, and the immortals and Harry Potter characters have to fix it.
In such a fanfic, the immortals could be the key to understanding the deeper magic that can counter the threat of nuclear war. Harry Potter, with his experience in fighting dark magic, might be in a unique position to bridge the gap between the magical and Muggle worlds during this catastrophe. The story could explore how magic and immortality can survive and thrive in a world that has been devastated by nuclear war, and how the values of the Harry Potter series, like friendship and courage, are still relevant in this extreme situation.
Well, perhaps in this fanfic, the wizarding world has to face a nuclear threat from the Muggle world. Wizards might use their magic to try and stop the missiles. For example, they could create a huge magical shield around major wizarding cities like Hogwarts. The characters from 'Harry Potter' would be in a race against time, with Harry, Hermione and Ron using their knowledge and skills to find a way to disable the nuclear weapons before they cause destruction. It could also explore how the wizarding society views the Muggle's most powerful weapon and how they interact with the Muggle governments during this crisis.
Harry Potter himself might become a symbol of hope in the fanfiction. He has already defeated Voldemort, so he could use his leadership skills to help the wizarding and Muggle worlds come together during the nuclear war. He could try to organize magical defenses for the remaining Muggles.
Well, it could change the Hogwarts curriculum in fanfic. Maybe they'd start teaching spells for radiation protection or how to deal with post - nuclear landscapes. And the houses could be re - sorted based on how students react to the threat of nuclear war. Gryffindors might be more likely to volunteer for dangerous missions to help the outside world, while Ravenclaws could be researching magic - based solutions to the nuclear fallout.
One plotline could be that a group of rogue wizards discovers how to create a nuclear - like magical weapon, similar to a nuclear bomb. They plan to use it to take over the wizarding world. Another could be that the Muggle world's nuclear technology somehow leaks into the wizarding world and causes chaos as wizards don't understand it at first. Or maybe Voldemort gets hold of a nuclear bomb through some Muggle - loving Death Eaters and tries to use it against both the Muggle and wizarding worlds.
Yes, there might be some out there. Some fanfics try to blend very different concepts in a creative way. However, it's a very strange combination. The Harry Potter world is about magic and mystery, while a nuclear bomb is a very modern and Muggle - related concept. But in the realm of fanfiction, authors might find a way to make it work, perhaps in an alternate universe where magic and nuclear technology co - exist in some strange way.
Harry would probably use his courage and leadership skills. He'd likely be at the forefront of trying to protect the wizarding world. Hermione would adapt by using her vast knowledge. She might study the Muggle technology behind nuclear war to find ways to counter it with magic. Ron would stick by his friends and use his practical skills. For example, he could help with the logistics of getting supplies to those in need. The three of them together would form a strong unit, just like in the original series, but with a new and much more dangerous threat to face.
Well, in a regular Harry Potter fanfic, it usually focuses on the events within the original Harry Potter universe, like exploring more about Hogwarts or the relationships between the characters. But in an 'Immortal Harry Potter crossover fanfic', it branches out into other universes. Harry is immortal, which gives him the ability to have adventures that span across different worlds and time periods.