Well, he could use it to uncover secrets that Dumbledore might have left behind. Since Dumbledore was a very knowledgeable and powerful wizard, his wand could hold the key to certain mysteries. Harry might be able to access hidden chambers or knowledge that was previously inaccessible. However, taking the wand could also bring a great deal of trouble. There could be those who would want to take the wand from Harry, thinking he doesn't deserve it or that it should be in their possession for their own dark purposes.
If Harry Potter takes Dumbledore's wand in fanfiction, it could lead to some really interesting character developments. For one, it could create a moral dilemma within Harry. He has always been a morally upright character, and taking someone else's wand without proper authorization might make him question his own actions. On the other hand, the wand's power could help him in his fight against the remaining dark forces. It might enhance his ability to protect Hogwarts and his friends. But it also might attract unwanted attention from old enemies of Dumbledore who see Harry as a new target now that he has the powerful wand.
Maybe in the fanfiction, there is a misinformation or a spell that has corrupted Dumbledore's mind. Harry, being the hero he is, notices the change in Dumbledore's behavior. He decides to take down Dumbledore because he thinks it's the only way to save the wizarding world from the new, dangerous path Dumbledore seems to be leading them on. For example, Dumbledore might be making alliances with dark forces unknowingly due to the spell, and Harry has to stop him.
One possible plot could be that Harry discovers some long - hidden secrets about Dumbledore's actions during the war. Maybe he finds out that Dumbledore knew more about Voldemort's plans but didn't act in a way Harry thought was right. So, Harry decides to take him to court to expose the truth and seek justice for those who suffered because of what he believes were Dumbledore's missteps.
In fanfiction, if Harry Potter snaps his wand, he might lose a great deal of his magical power. His wand is his primary tool for casting spells, so without it, he'd be in a very vulnerable position. He could start to explore alternative forms of magic or seek out a new wand, perhaps through some extraordinary adventure. This could also lead to him relying more on his friends and the skills he has developed outside of wand - based magic.
In the 'Harry Potter gets a second wand fanfiction', it could change his relationships too. His friends might be both amazed and a bit worried. Hermione would probably be eager to study the implications of having two wands. Ron might be a bit jealous at first. And Harry himself would need to learn how to balance the power of two wands, which could be a real struggle, both physically and mentally, as different wands have different 'personalities' and he'd have to master them both.
Perhaps in this fanfiction, the custom wand is created by a very eccentric wand - maker. This wand - maker could have some strange ideas and methods. The wand could be designed to work in harmony with Harry's emotions. So when he's feeling angry, it might produce a more powerful spell, and when he's calm, it could be more precise. This would add a new dimension to Harry's magical abilities and how he uses them in different situations.
Well, he could end up with a wand that has a much darker origin. This could lead to other wizards being suspicious of him. His relationships with his friends might change too. Hermione might be more cautious around him, and Ron could be a bit more distant. Also, his dueling abilities would be completely different. He might struggle at first to adapt to the new wand's unique way of channeling magic, which could put him at a disadvantage in battles against Voldemort and his Death Eaters.
In the 'Harry Potter gets a new wand fanfiction', Harry getting a new wand could lead to a whole new set of adventures. He might have to go through a series of trials to fully bond with the wand. The wand could also have a mind of its own, guiding Harry towards certain magical discoveries that were previously unknown. It could also attract unwanted attention from dark wizards who are jealous of its power.
Well, he might have enhanced magical abilities. The griffin is a powerful and majestic creature, so the wand could give him unique powers, like better control over transfiguration spells.
Maybe he takes it out of a sense of duty. Harry might feel that he needs to carry on Dumbledore's legacy and that using his wand is a way to do that. He could believe that Dumbledore's wand holds the power to defeat the remaining threats to the wizarding world.
In fanfiction, if Harry Potter's wand fuses with the Elder Wand, it could potentially create an extremely powerful magical object. Harry already has a strong connection with his own wand, and the Elder Wand is known for its near - omnipotent power. The fusion might result in him having an unrivaled control over magic, perhaps being able to perform spells with ease that were previously difficult or even impossible. It could also change the balance of power in the wizarding world, as he would be in possession of a wand that combines the loyalty and unique properties of his original wand with the raw power of the Elder Wand.