Narsil was destroyed after killing Sauron in the first scene of The Fellowship of the Ring
The blade has to be rebuilt in order to gain the support of the undeads.
When Aragorn goes down in their cave, it already has Narsil with him.
Aragorn is the gold he talks about, he has a dinasty of kings behind him, but he doesn’t glitter because he has yet to get his crown back, as of now he’s just a wanderer.
Eventually in the end, Aragorn will be king as he deserves to be.
Not even close.
From the ashes of the Isildur dinasty, Aragorn will rise again, bringing the humans together in the last fight. The fire represents the work of the blacksmith who’ll recreate Narsil, the blade named two lines down.
The wander he talks about is Aragorn, who was still wandering around the middle-earth before meeting the fellowship of the ring in the tavern.
In the black speech of Mordor:
Gakh Nazgi Golug durub-ûri lata-nût,
Udu takob-ishiz gund-ob Gazat-shakh-ûri,
Krith Shara-ûri matûrz matat dûmpuga,
Ash tug Shakhbûrz-ûr Ulîma-tab-ishi za,
Uzg-Mordor-ishi amal fauthut burgûli.
Ash nazg durbatulûk, ash nazg gimbatul,
Ash nazg thrakatulûk, agh burzum-ishi krimpatul
Uzg-Mordor-ishi amal fauthut burgûli.