In this type of fanfic, the Infinity Stones could have a very different effect in the Harry Potter universe. For example, the Time Stone could be used to reverse dark spells or resurrect fallen wizards. However, the Stones' power might also be limited by the magic rules of the wizarding world. The fanfic could delve into how the characters from both universes adapt to the presence of the Stones and how they use or misuse their power.
Yes, there are likely some fanfics out there with this concept. The 'Harry Potter' universe and the idea of the Infinity Stones from the Marvel universe are both very popular, so some creative fans might combine them in their fan - created stories.
One way could be through a powerful dark wizard's experiment. Maybe a wizard, seeking ultimate power, discovers a way to bring the Infinity Stones into the magical world. They could be hidden as powerful magical artifacts, and their powers might be harnessed in a way similar to how wizards use magic. For example, the Time Stone could be used to manipulate time within the wizarding world, perhaps to reverse a tragic event or to gain an advantage in a battle.
He might become extremely powerful. The Infinity Stones have the power to manipulate reality, time, space and more. Harry could use it to defeat Voldemort in a much easier way. For example, with the Time Stone, he could go back in time to prevent certain events that led to Voldemort's rise or stop him from ever being born.
Let's say Hermione found an Infinity Stone. She would immediately start researching it. She would scour the Hogwarts library and use all her knowledge of magic. She might try to find a way to control it or at least contain its power. She could also consider the ethical implications of such a powerful object. Would it be like a Horcrux? Should it be destroyed? These are the kinds of questions she would ask herself.
Well, it could be that Voldemort teams up with Thanos somehow. Maybe Voldemort is attracted by the power of the Infinity Stones. He could use the Time Stone to go back and change some key events in the wizarding world to his advantage, like preventing Harry's parents from being protected by the Fidelius Charm.
Well, Harry Potter could use his magic skills. For example, he could use the Patronus charm to fend off some of the alien creatures in Infinity War. His knowledge of spells like Expelliarmus could also be used to disarm the villains' weapons.
It could bring back powerful wizards. For example, if a wizard like Merlin was resurrected using the power of the Infinity Stones, it would change the power balance in the wizarding world. He could have knowledge and magic far beyond what is currently known, and his return could either help in the fight against evil or cause new problems if his views are different from the modern wizards.
You can start by looking on popular fanfic websites like Archive of Our Own (AO3) or FanFiction.net. Just use the search bar and type in relevant keywords like 'Harry Potter' and 'Infinity Stone' to see if any such fanfics pop up.
Hermione Granger would also be a crucial character. Her intelligence and vast knowledge of magic could be key in understanding the powers of the Infinity Stones and coming up with strategies to deal with them. She could also be the one to communicate with the Avengers if they come to Hogwarts, as she is good at dealing with new and complex situations.