@Morsealworth - I don't think there ever was a fantasy race that's bad with metal weapons.
Fairies are supposed to be bad with iron and good with magic, but it's rare for succubi to be classified as fairies. Succubi are demons by default.
@flannan In some settings, elves or similarly nature attuned races like spirits and fairies show an extreme allergic reaction to most metal.
Mist Elves from the game ADOM comes to mind:
"...they are the most fairy-like of elves, going so far that the prolonged touch of mundane metal burns their skin like acid. Thus they prefer to wear and wield weapons and armaments of precious metals, like mithril or adamantium."