Elendils Sword Has a Long History in Middle-earth

The origin of the sword is revealed to readers of J. R. R. Tolkien's The lord of the rings When Aragorn Viggo Moetensen and his friends arrive in Rohan. The guards, hostile to their arrival, asked them to disarm before entering the hall. Aragorn warns the guards not to touch his sword or they’ll get hurt, revealing “Telchar first wrought it in the deeps of time”. Telchar was the greatest Dwarven blacksmith from early in the First Age, dwelling in the Blue Mountains. He’s responsible for creating such legendary weapons such as Angrist, a famous knife from Tolkien’s The Silmarillion, and the Dragon-helm of Dor-lmin which was a helmet that would protect the wearer from injury and strike fear into the heart of their enemies, found in Tolkien’s The Children of Hrin.

It would seem that Telchar had a gift to imbue the objects he created with the ability to protect its owner and cause fear in their enemy, because Narsil had this same effect, along with some added bonuses. The blade was given as a gift to one of the first Elven High Kings and, a few generations later, Narsil was inherited by Elrond’s brother Elros, the first King of Nmenor. Many, many generations later in Nmenor, Elendil was born as a direct descendant of Elros and that is how he inherited the sword in Tolkien Lore.