The sword might also have a connection to the spirit world. It could allow Naruto to communicate with the spirits of the Uzumaki clan or gain insights from their past. This would give him an edge in battles as he could learn from the experiences of his ancestors.
In many fanfictions, Naruto might obtain the Uzumaki sword through a hidden inheritance. Maybe it was left behind by an ancient Uzumaki clan member and Naruto discovers it in a secret location, like an old, forgotten Uzumaki shrine.
The Uzumaki sword might have the power of sealing. The Uzumaki clan was known for their sealing techniques. So, it's possible that the sword can be used to seal away powerful enemies or even seal away dangerous jutsu. It could also have the ability to cut through powerful defenses. Maybe it has some sort of special chakra edge that can break through barriers that are otherwise difficult to penetrate. Additionally, it could have a connection to the Uzumaki's life - force, allowing Naruto to draw on some of that power in times of need.
He could use it to discover more about his Uzumaki heritage. Maybe the sword has some special powers or markings that are related to the Uzumaki clan. It could also put him in danger as others might be after the sword for its power or value.
Maybe the dragon sword has the ability to absorb chakra. When Naruto is in a fight, he could use this to his advantage by draining his opponents' chakra through the sword when it makes contact. This would weaken his enemies and at the same time, the absorbed chakra could be used to power up the sword's other abilities.
One possible ability could be enhanced cutting power. It might be able to cut through almost any material, even chakra - based defenses with ease.
In this fanfiction, Naruto getting the Uzumaki bloodline could lead to him having a stronger connection to his family heritage. It could also mean he has better control over his life - force energy, which is something the Uzumaki clan is associated with. Maybe he could even unlock some unique Uzumaki - only jutsus that no one has seen in a long time.
The sword might be able to enhance Naruto's existing jutsus. For example, his Rasengan could become more powerful when combined with the sword's energy. It could also give him new elemental powers, like the ability to control lightning or fire in a different way than before.
One possible ability could be enhanced cutting power. It can slice through the toughest of materials, like it's cutting through butter. For example, it could easily cut through solid rock or even chakra - enhanced defenses.
The sword might have special abilities that Naruto can tap into. For instance, it could allow him to use a new type of chakra or jutsu. Maybe it gives him the ability to control shadows or fire in a way he couldn't before. This would completely change his fighting style and make him even more formidable against his enemies.
In fanfiction, Naruto's Uzumaki bloodline often gives him enhanced chakra reserves. This allows him to perform more powerful jutsu for longer periods. For example, he can spam his Rasengan more frequently without getting exhausted quickly.