The sword of nasil is a holy sword with summoning ability and a king's sword symbolizing justice owned by Aragon in the Lord of the rings film. The sword of narsil was forged by the famous dwarf craftsman tarcha in the first era. Soren's finger with the supreme ring was cut off by it.

The sword of narsil shines with the light of the sun and moon, which is the origin of its name. In the final alliance battle, elandir was killed by Sauron and the sword of narsil was crushed to pieces. His son isirdu picked up the broken sword and cut off Sauron's finger wearing the ring, thus winning the war. After isirdu was shot by the orcs and Arnault was destroyed, the broken sword fragments have been preserved in the valley. Until the rise of Aragon, the broken sword fragments were recast and named andulir!

During the Lord of the Rings War, Aragon participated in almost all key battles with andulir, and the sword of narsil gave him courage and strength. Especially in the final battle of the black gate, Aragon fought against the army of Mordor with Anton lear to buy time for Frodo. Until the supreme ring was completely destroyed, Sauron's Dark Kingdom ceased to exist, and the Dark Lord was finally completely defeated.

Source: @watsonsith