One way it could happen is through the power of the Time - Turner. Harry could use it to go back in time and prevent the event that injured Tony Stark in the first place. Or he could take Tony to Hogwarts where the advanced magic and potions could be used to heal him. The magic potions like the Felix Felicis could be given to Tony to enhance his chances of a speedy recovery, and the healing spells of Madam Pomfrey could also be very effective.
Well, one possibility is that Tony Stark might be intrigued by Harry's magic. He could try to find a scientific explanation for it, like he does with everything. Maybe he'd want to incorporate some magic into his tech, creating some super - advanced magical - tech hybrids.
One possibility is through magic. Harry Potter is known for his powerful magic skills. He could use spells like 'Episkey' or more advanced healing magic. Maybe he stumbles upon Thranduil who is injured in some enchanted forest. Harry, being the kind - hearted hero, decides to use his magic to heal the elven king.
One way it could happen is through magic. Harry Potter is well-versed in powerful magic. He could use spells like 'Episkey' or more complex healing magic to mend Pietro's injuries. Maybe he'd have to study some new spells specific to Pietro's unique speedster physiology.
He might use the Patronus charm. The Patronus is not just for fighting Dementors. In this fanfiction, it could be that the positive energy of the Patronus is used to heal Tony Stark's soul. Maybe Stark has some sort of emotional or mental trauma from his battles, and the Patronus charm can soothe and heal those wounds.
Well, in such a fanfiction, Harry could gain access to Stark's advanced technology. Maybe he'd use Iron Man suits in his battles against the dark forces at Hogwarts. It would be a really cool blend of the magical and technological worlds.
Maybe Harry travels to the Marvel universe and tries to learn from Tony Stark. He could be interested in Stark's technology for some reason related to fighting Voldemort, like using it to detect Death Eaters.
Imagine Petal is a girl who is a huge fan of both Harry Potter and Tony Stark. She has the ability to travel between the two universes. In the Harry Potter world, she uses her knowledge of Tony Stark's technology (which she somehow has) to solve some magical problems. In Stark's world, she uses her magic to help Stark with some of his more difficult projects. So, Petal serves as a link between the two very different fictional universes.
Well, one way could be through magic. Harry Potter has a whole arsenal of spells. He could use a protection spell to shield Tony Stark from an incoming attack. Maybe Iron Man's suit malfunctions during a battle, and Harry, being in the right place at the right time, uses 'Reparo' to fix it.
Well, Harry might get access to some really advanced technology. He could use it to his advantage in the wizarding world. For example, he could use Stark's communication devices to keep in touch with his friends at Hogwarts more easily.
It depends on the situation. In the wizarding world, Harry Potter would be more powerful as he can use magic which is a fundamental part of that universe. He can cast spells to defeat enemies, protect himself and others, and manipulate the environment around him.