Well, it could be that Naruto stumbles upon the Uzumaki temple while on a mission. Once inside, he might encounter some sort of guardian spirit. This spirit could test Naruto to see if he's worthy of the Uzumaki heritage and the treasures within the temple. If he passes the test, he could gain access to special Uzumaki artifacts.
Well, it could lead to him uncovering secrets about his family. Since he is an Uzumaki himself, these scrolls might have information about his parents or ancestors that he never knew before. This could give him a deeper understanding of his heritage and place in the ninja world.
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.
Well, it could be that Naruto finds a connection to an old shinobi clan in the ancient temple. This discovery could lead him on a new adventure to learn about their history and techniques. There might also be a spirit or an old sage in the temple that imparts some wisdom to Naruto, helping him become a stronger ninja.
He could find a new type of chakra or power source. For example, the dragon temple might have a special pool of chakra that enhances his existing abilities or gives him new ones like the ability to control elements in a different way.
It could have Naruto discovering long - lost jutsu in the Uzumaki library. Maybe some ancient scrolls that hold the secrets of powerful chakra control techniques.
Naruto could encounter a group of rogue ninja who are also after the treasures in the Uzumaki temple. Then he'd have to fight them off to protect the temple and its secrets.
The scrolls could hold secret jutsu. Uzumaki clan was known for unique abilities, so it might be something like a powerful sealing jutsu. Maybe Naruto discovers a new way to enhance his Rasengan using the knowledge from the scrolls.
Maybe it contains some long - lost jutsu. Uzumaki clan was known for their powerful sealing techniques, so it could be a scroll with a unique sealing jutsu that Naruto can learn and use to his advantage in battles.
Perhaps the Uzumaki survivors are in danger from an old enemy of their clan. Naruto finds them just in time to protect them. He then teams up with them to take on this threat. Since the Uzumaki are known for their strong life force and chakra, they could be a great asset to Naruto. They might also have a connection to the Nine - Tails, which could add an interesting twist to the story.
In the fanfiction, Naruto could meet someone who knows a lot about the Kusanagi. This person could be an old sage or a mysterious traveler. They could teach Naruto how to use the sword properly and unlock its true potential. It could also lead to Naruto getting into some battles where the Kusanagi gives him an edge, and he has to learn to adapt his fighting style to include swordplay.