Perhaps I mixed you up with someone else. Someone claimed that here was no evidence that humans ever made their own spellcraft. That’s what I was responding to, while also going on tangents, as is my wont.
I did say stuff to that effect, I think. There is no direct evidence in the text for it that I know of, so I think the point stands - Tolkien isn't a guy who thinks of humans as supreme and awesome, finding out the secrets of the Universe for themselves. That's not his ethos. He's much more about the power of the prime mover being handed down over and over again, diminishing a bit each time, until we wind up with an entirely mundane world like we have today.
The barrow wights were the ghosts of kings and nobles
The bodies of kings and nobles. The spirits to animate them were sent by the Witch-king.
... nitpicking the term I used isn’t particularly interesting or helpful.
It was helpful as a launching point for the history - the people who made those barrows were folks that had been interacting with Valar and elves for thousands of years, since the First Age, not independent people who had to work out magic for themselves.
Regardless of any idea of them being isolated, or having learned the craft of making magic items from someone else, the Numenoreans were Men, humans, not Maiar or anything like that. Special humans, sure, but very much mortal men.
With a touch of elven blood, but yes, mortals.
But, again, you seem to still be mistaking my point. I never said there were no humans who new how to work magic - I said there was no evidence that they worked it out independently. And I said that in support of the notion that it seems that "wizards" means something specific to Tolkien that is not the common wizard trope we have in D&D and much of the rest of modern fantasy. That should not be surprising - Tolkien was not writing in the midst of modern fantasy. Using the term as he did wasn't putting him in conflict of genre expectations, as the genre as we understand it now didn't exist at the time. So, we should not expect or insist that Tolkien conforms.