Slitherine

Start game with custom wizard with alchemy and race barbarian.
And we can get two settlers with magic weapon.
Create outpost with those settlers.
So we can get two barbarian swordsmen with magic weapon.

I think this is bug (cause barbarian should not be able to equip magical weapon).
I'm not sure to see barbarian mercenaries has magic weapon, but maybe.

Barbarian units may get magical weapon via Uranus' Blessing city enchantment.
I don't know it is bug or feature, but it is works in 6.06. (I didn't check in 6.07)

It's a feature. Uranus blessing is the only way barbarians can get magic weapons (mithril, adamantium, orihalicon).