Feather Sword

"A feather sword? That's what the crown gifted you? A toy meant for those that never have to defend anything but their honour? I'm not sure whether it's meant to represent the hope you'll never have to wield a weapon again, or pure offensive naivety."
"Oh but it's worse. See, it's a ceremonial sword. So I can't even use it in a duel, because it would get damaged if you so much as look at it wrong. Too fragile to hold any mana as well, meaning its only purpose is decorative. No matter how it's meant, I'm taking offence."

Use

Non-lethal duels

Users

Nobles, Gentry

Honour Versus Survival

A tradition primarily enjoyed in peaceful parts of the country, feather swords are swords designed strictly for duelling. Their thin blades make them unsuited for slashing and even if they were sharp-tipped, they would have a hard time piercing proper armour. Given how feather swords also have their tips rounded and sometimes even covered, they would have little use in a real fight.
This both makes them useless for actual combat, and perfect as a duelling weapon. Light protection is already enough to guard against most kinds of injury, allowing easy practice without the risk of harming someone. And those that desire blood can simply choose to forego armour, though that does risk the occasional fatal injury.

To many a noble or member of the gentry, a feather sword is a symbol of their well-mannered ability to defend their honour. Young nobles receiving education at the royal court will often duel to improve and show off their skill. Some of them even look down on those that do not wield one.
Meanwhile, those from the border, and others that also live in more dangerous circumstances, have a heavy preference to real swords. They usually care little about learning how to handle a weapon that they cannot use in actual combat. This goes especially for people from the Verglas dukedom, as feather swords are unsuited to practice Verglassing a weapon. They would rather wield a blunted heavier weapon, and normally duel with sharp swords. To those risking their life in actual combat, feather swords are naught but an insult.