Basically, yes.

In the books it was just that they would only answer to Isldur’s Heir. They also scared the Corsairs of Umbar away from their ships, but it was an army of Dunadain (along with a few elves, like Elrond’s sons) that actually ran them off permanently, so they could use the ships to bring some of the Gondorians in the south back north to join the main battle.

There was a book like that, but this illustration is from a calendar James Gurney did.

I mean, it’s supposed to be.

Probably still won’t stop future humans from opening the vault, sadly.

I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours. ― Stephen Roberts

And that is why I love having AAA.