In some fanfiction concepts, the dragon sword might give Harry Potter a connection to an ancient magic that has been long forgotten. This could unlock spells and abilities that are not known in the normal wizarding world. For example, it could give him the power to transform into a partial - dragon form, with increased physical strength, speed, and the ability to breathe fire. The sword could also act as a key to hidden dragon lairs filled with treasures and ancient knowledge that Harry could use to defeat Voldemort once and for all.
The dragon sword might give Harry Potter enhanced combat abilities. It could potentially allow him to cut through dark magic defenses more easily, much like how the Sword of Gryffindor could destroy Horcruxes. Maybe it gives him the power to communicate with dragons, since it's a dragon sword, and use their strength in battles against Voldemort and his Death Eaters.
Well, in fanfiction, the dragon sword could bestow upon Harry Potter the power of flight or at least levitation. This would be a huge advantage as he could quickly move around battlefields or escape dangerous situations. It could also give him the ability to summon dragon - like fire, a powerful offensive weapon against his enemies. Another possibility is that the sword gives him the power to sense danger from a distance, sort of like a dragon's natural instinct for self - preservation.
The dragon sword in the fanfiction might be long and slender, with a blade that shimmers like dragon scales in the sunlight. The hilt could be made of a dark, enchanted metal, perhaps with a dragon's head carved at the end, its eyes seeming to glow with an inner fire.
It could have the ability to communicate with Harry on a psychic level. Telling him when danger is near or guiding him on how to use its powers most effectively in different situations.
In the fanfiction, Harry Potter might gain the power of precise control. The Nuibari is known for its ability to stitch things together in the original Naruto context. So perhaps Harry could use it to 'stitch' spells together in a new and unique way, creating more powerful and complex incantations.
It could be an entirely new type of dragon created specifically for this fanfiction. The author might have wanted to introduce a unique dragon with special abilities, like a dragon that can change its color to blend in with its surroundings or one that can breathe not just fire but also some kind of magical ice. Harry would then have an even greater challenge when trying to kill it with the sword.
There's also a possibility that it's a Chinese Fireball. These dragons are very beautiful and powerful. In a fanfiction, the author might choose this type of dragon for Harry Potter to own because it would add an element of exoticism and grandeur to the story.
A RWBY character with the Sword of Gryffindor might also experience a change in their personality or outlook. Since the sword is associated with Gryffindor values, the character could become more courageous and noble. They might also start to uphold values that are more in line with the Harry Potter universe, which could create an interesting dynamic within the RWBY world.
In many fanfictions, Harry might use his powerful spells like the Stunning Spell or the Killing Curse if the story allows for such dark magic use. He could also use his intelligence to outwit the dragon, perhaps finding a weakness in its armor or behavior pattern and then using a well - timed spell to defeat it.
In many Harry Potter - related stories, the sword of Gryffindor often finds its way to those who are worthy. Maybe in this fanfiction, Harry discovers it in a similar way. It could be hidden in the Sorting Hat, or perhaps it's presented to him by some magical creature that recognizes his need and his courage.
In this fanfiction, Harry Potter could obtain Gungnir in a rather unexpected way. For example, due to a time - traveling incident. He might accidentally travel to a different time and place where Gungnir exists. There, he could be in a situation where he has to help the local magical community. As a result of his heroic deeds, the keepers of Gungnir decide to entrust him with it. And when he returns to his own time, he brings Gungnir with him, ready to use it in his fight against the dark forces.
Well, it could potentially give him an edge in combat. Maybe he can use it to defeat dark creatures more easily. For example, if he faces a Dementor, the sword might be able to disrupt its form in a way normal spells can't.