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.
Harry's magic is the key to Thranduil's healing. His spells can directly target the injuries or ailments of Thranduil. For example, if Thranduil has a poisoned wound, Harry could use magic to draw out the poison and then close the wound.
Dumbledore might also play a role. He has vast knowledge and experience. He could offer some wise advice or even provide a special magical item or spell that is crucial for the unicorn's healing.
One of the main themes is friendship. Despite their differences, fanfictions often show Harry Potter and Thranduil forming a friendship. This friendship is usually based on mutual respect for each other's abilities and knowledge. Also, the theme of adventure is quite common. Since both characters are from rather adventurous worlds, they often go on quests or face challenges together in the fanfictions. For example, they might team up to fight a new dark magic threat that neither of their worlds has faced before.
Yes, there are quite a few out there. Some focus on how Harry, as the son of Thranduil, would bring a unique perspective to the wizarding world. For example, in some fanfictions, his elven heritage from Thranduil gives him an edge in magic related to nature and archery. It's really interesting to see how authors blend the two very different fictional universes of Harry Potter and The Hobbit/Lord of the Rings.
In some fanfictions, Snape might use his advanced knowledge of potions to create a special concoction to heal Harry. He could draw on his skills in Herbology as well to find rare ingredients for the potion.
Well, in some fanfictions, Harry might use his advanced magic skills. He could use a combination of powerful healing spells he learned from Hogwarts or perhaps some ancient magic that he discovers. Maybe he has to face some challenges or overcome certain dark forces that were causing the Longbottoms' problems in the first place.
In such a fanfiction, perhaps Harry uses his magic skills learned at Hogwarts. He might first find the injured unicorn in the Forbidden Forest. Then, using a spell like 'Episkey' or some advanced healing magic he's discovered. The unicorn could be injured by dark creatures or a trap set by poachers.
Well, perhaps Harry gets lost in a magical portal and ends up in Middle - earth near Rohan. He finds Theoden ill or injured. Harry uses his magic, like the spell 'Ferula' to bind wounds or 'Brackium Emendo' to mend broken bones. Then he has to deal with the Rohirrim's suspicion of his strange magic.
A common theme is the clash and融合 of different magical systems. Harry's wizardry from the Potterverse and the elven magic in Thranduil's world often collide or combine in interesting ways. Another theme could be the culture shock that Harry experiences in Middle - earth. He's used to the wizarding world in Britain, but the elven society is very different.