Perhaps in the fanfiction, Hermione breaks Harry's wand as a form of sacrifice. There might be a situation where they are facing a very powerful dark force, and she realizes that breaking his wand, which is a very powerful magical object, could be used to create a diversion or some sort of magical energy burst that could help them defeat the enemy. It could also be a sign of her taking extreme measures when all other options seem to be exhausted.
Well, one possibility could be that it was an accident. Maybe Hermione was in a rush during a spell - casting practice session and accidentally knocked Harry's wand out of his hand and it broke on a hard surface. Another could be that she was under the influence of some dark magic or a spell that made her lose control and break it in a fit of rage or confusion.
Harry might be initially shocked and angry. After all, his wand is an important part of his identity as a wizard. He could lash out at Hermione immediately, demanding an explanation for her actions.
In the 'Harry breaks his wand fanfic', perhaps Harry will struggle a great deal. Without his wand, he might have to rely on his non - magical skills and knowledge more. He could be in a very dangerous situation in the wizarding world where magic is often a means of defense and problem - solving.
Perhaps in the fanfiction, the Basilisk has a hidden power that can only be unlocked by Harry's wand. A prophecy states that Harry must use his wand to unlock this power and use it for good. However, there are those who want to use the Basilisk's power for evil. Harry has to race against time to figure out how to use his wand to unlock the power and keep it out of the wrong hands. This would involve a lot of exploration of the Hogwarts secrets and battles against dark forces.
One possible reason could be their different career paths. Harry might be more focused on Auror work which is dangerous, and Hermione, being the practical person she is, may not want to live in constant fear for his safety. Another reason could be a growing apart in their values. Maybe as they get older, Hermione realizes that Harry has a more impulsive nature when it comes to making decisions regarding the wizarding world's politics, while she prefers a more calculated approach.
Well, perhaps it could be an accident during a Quidditch match. Harry might accidentally hit Ron with his broomstick while chasing the Snitch, causing Ron's leg to break. It could also be due to a spell gone wrong in a chaotic situation at Hogwarts, like when they're being chased by some dark creatures and Harry's hasty spell rebounds and hits Ron's leg.
Perhaps Tonks starts dating someone else, like Remus Lupin. Harry has some unspoken feelings for Tonks, and seeing her with Lupin makes him feel heartbroken. In the fanfiction, it could show Harry's internal struggle to accept the situation and his pain at seeing the woman he cares about with another man.
One possible plot could be that Snape reveals some long - held secret about Harry's parents in a very cruel way. For example, he might tell Harry that his father was not as heroic as he thought, and this shatters Harry's idealized view of his family, thus breaking his heart.
Well, it could be that Edward, perhaps jealous of Harry's popularity or a girl he likes, spreads false rumors about Harry. This causes Harry to be ostracized and his heart to break as he loses friends and respect.
Well, perhaps he uses some powerful magic he's learned secretly. Maybe he has help from unexpected allies, like a magical creature that can bypass the prison's defenses.
Often, the plot of 'Harry breaks his wand fanfic' starts with the accident or incident that breaks the wand. Then, Harry has to face immediate challenges like not being able to perform basic spells for protection or daily tasks. He may then set out on a journey to either repair the wand or find a replacement in an unorthodox way.