One way could be that the Infinity Stones are hidden artifacts in the wizarding world. Maybe they were created by an ancient and extremely powerful wizard long ago, and their powers are so great that they are feared and thus hidden. For example, the Time Stone could be related to time - turners, but with much more powerful time - manipulating abilities.
In fanfiction, the Infinity Stones could be the key to unlocking some of the most powerful magic in the Harry Potter universe. They might be linked to the creation of Hogwarts itself. Suppose the Reality Stone was used to shape the magical school, allowing it to exist in a state that can only be perceived by those with magic. It could also be that the Soul Stone has a connection to the afterlife in the wizarding world, perhaps having the power to bring back the souls of dead wizards under certain conditions.
The Infinity Stones could be linked to the Deathly Hallows. Maybe the Resurrection Stone has a connection to the Soul Stone. They could both have the power over life and death in different ways. And the other Infinity Stones could be related to the Elder Wand's power of domination and the Cloak of Invisibility's power to conceal, but on a much grander scale, if they were to be incorporated into the Harry Potter world.
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.
The Stones could also be a source of conflict in the fanfiction. Different factions in the demigod world might want to get their hands on the Stones for their own purposes. Some might want to use them for good, like protecting the world from Titans or other threats, while others could be more interested in using the Stones' power for personal gain and domination.
The Power Stone, being a source of immense destructive power, could be a game - changer in Star Wars. It could potentially destroy entire star systems with a single blast. This would force the various factions in Star Wars, like the Galactic Empire or the Rebel Alliance, to either try to obtain it for themselves to gain an upper hand, or to prevent their enemies from getting it. It would introduce a whole new level of threat and power struggle that goes beyond the typical lightsaber battles and political intrigue.
In fanfiction, Mother Earth could be a hidden force that has been dormant for a long time. But due to some great imbalance in the wizarding world, she starts to awaken. Harry Potter might be the one to first sense her presence, maybe through a strange dream where he sees the earth itself calling out for help. Then, as the story progresses, he discovers that Mother Earth can communicate with certain wizards, and she imparts her wisdom to him to help him fight against the forces that are causing the imbalance, such as over - use of dark magic that is harming the natural world.
Perhaps the Chaos Emeralds are hidden in different wizarding schools around the world, and in the fanfiction, a quest is set up for Harry Potter and his friends to find them all. Each emerald could grant a different ability, such as the power to control the elements, which could be used against the rising dark forces in the wizarding world.
The Infinity Stones in the Harry Potter world could change the nature of magic. The Reality Stone could make illusions so real that they become tangible. Wizards might mistake it for a new form of advanced transfiguration. The Soul Stone could have a connection to the wizard's soul, perhaps allowing a wizard to transfer their soul into another object or person, which would be a very dark and dangerous power in the hands of the wrong wizard. There would be so many possibilities for interesting storylines.
Harry could use the Mind Stone to read the thoughts of his enemies, like Voldemort. This would give him an edge in the fight against the Dark Lord. Hermione might use the Time Stone to gain more time to study and find solutions to difficult problems, like how to defeat a powerful dark magic spell.
They could be a new magical invention by a young, brilliant Ravenclaw student. This student could be trying to find a way to help those with vision problems in the wizarding world. But the contacts end up having some unexpected magical properties, like changing color in the presence of certain spells or magical auras. Harry Potter could then get involved when he realizes that these contacts might be the key to solving a mystery related to a series of strange magical events happening around the school.
Venom's ability to heal quickly could also play an important role. In the Harry Potter series, injuries are common during battles and duels. A character with Venom's healing factor would have an advantage. They could survive attacks that would normally be fatal and keep on fighting. This could change the dynamics of battles in the fanfiction world. For example, if Harry was bonded with Venom, he could survive Voldemort's Killing Curse due to Venom's healing ability.