There's an even easier way. In a fantasy world, fantasy metals are a thing. Said fantasy metals could easily be said to be able to break through magical barriers, embodying the basic trope of the silvered weapon from yesteryear.
Said fantasy metals could also be reasonably dense, heavy, and difficult to handle, but would otherwise be mundane things relative to their universe.
Ergo, martials who specialize in swinging heavy things can take magic head on with nothing more than something slightly better than steel or iron. (And thats without getting into speculative metallurgy to see how your titaniums, tungstens, and even plutoniums would fit into those dynamics).
And the naysayers who say "but then martials
NEEEEEED them", would be wrong, because in this context, anybody who looks to swing a sword would
want them, for the same fundamental reason they'd want a steel sword instead of a rusty pig iron sword.
The
addition of magical enchantment in this context would only be a further desirable trait, but not one that was strictly necessary. Id see such enchantments as being more focused on diversifying capabilities and acting as a force multiplier, but damage and baseline capability would all be driven by the metals own inherent, in-universe-mundane qualities.
(Ie, the stuff Im doing in LNO is the right way to do it huehuehuue

)