Well, it could be about Harry and his friends having to journey into the Land of the Dead to retrieve a powerful magical artifact. Maybe they need it to defeat a new dark wizard who is using the power of the dead to gain strength.
It could be a powerful dark wizard who has found a way to control the forces in the Land of the Dead. Maybe he was once a student at Hogwarts who delved too deep into the Dark Arts and now wants to use the power of the dead to rule the wizarding world.
He could use it to build a magical sanctuary for endangered magical creatures. This would be a place where they could live and breed safely, away from the threats they face in the wizarding world.
One possibility could be that the dark magic in the Harry Potter world somehow creates a zombie - like plague similar to the one in The Walking Dead. Harry and his friends then have to use their magic skills not only to fight the dark wizards but also to survive the hordes of the undead. They might create magical barriers to keep the zombies out of Hogwarts.
The plot could center around a love triangle. One character is so in love with another that they feel dead without them. However, the object of their affection is in a relationship with a third person. This could lead to a lot of drama and conflict.
One possible plot could be that Voldemort uses the dark magic to create a plague similar to the one in The Walking Dead. The wizards and witches have to not only fight against the undead but also Voldemort's forces. Harry and his friends would need to find a way to stop the spread of the plague and defeat Voldemort once and for all, while also learning how to survive in a world filled with the walking dead.
Perhaps Voldemort somehow manages to bring the Left 4 Dead zombies into the wizarding world. The Order of the Phoenix and the Death Eaters are forced to team up to survive. The Death Eaters' dark magic might be used in new and unexpected ways against the zombies, and the Order's more defensive and protective spells would also be crucial. Harry, being the hero, could figure out a way to stop Voldemort from bringing in more zombies and find a way to send the existing ones back.
Well, one possibility could be a world where the magic from Harry Potter is used to combat the zombies in The Walking Dead. Maybe the wizards and witches from Harry Potter's world have to team up with the survivors in The Walking Dead universe. For example, they could use spells like the Patronus to ward off the zombies, which are drawn to negative emotions like Dementors. The Mashone aspect could perhaps be a new group of characters that have their own unique skills or magic that helps in this fight.
One possible plot could be that a powerful dark magic spell goes wrong in the Harry Potter world and creates a portal to the world of The Walking Dead. Harry, Hermione, and Ron find themselves in this post - apocalyptic world filled with walkers. They have to use their magic skills to survive, like using the Stunning Spell to immobilize walkers and the Fire - Making Charm to keep the walkers at bay at night. Meanwhile, some of the survivors from The Walking Dead world are in awe of their magic and start to learn from them, creating a unique bond between the two groups.
One possible plot could be that a spell gone wrong in the wizarding world accidentally opens a portal to the world of The Walking Dead. Harry Potter and his friends find themselves in this post - apocalyptic world. They use their magic to fight off the walkers, but also face moral dilemmas as they interact with the survivors who have no concept of magic. Hermione might try to find a scientific explanation for the walkers while Ron is more focused on survival and getting back home.
The plot could involve a situation where a new form of dark magic is unleashed in the wizarding world, which spreads like wildfire and causes destruction similar to 911. The Ministry of Magic is caught off - guard. Hermione, with her vast knowledge, starts researching a way to counter this magic. Meanwhile, Ron and Harry lead the effort to protect the civilians. They set up shelters in places like the Room of Requirement and use Patronuses to guide people to safety. As they dig deeper, they discover that this dark magic was a planned attack by a long - hidden dark wizard group who wants to take over the wizarding world.