Proper Color Theory

You've decided to make your magic sword a special kind of color, not black like usual. You look around, see a bunch of purple, and think purple is the way to go. Stop! Check out how all that purple stuff has been doing and realize that the breakdown in mass culture has caused the fashion trends that were supposed to dominate society for approximately ten years have all been failing. Then make the sword black.

Speaking of Demon Swords

If those exists, there's probably a census category for them. Gonna want to keep track of that for sure.

Generations of Courage

"I am afraid that because of that pact, Galegmos may be harmed by nothing but the sword Condita, lost long ago. I can give you my notes to help you find it, but . . ."
"But?" The brave young members of the desperate band leaned forward to ensure they heard every one of the sage's words.
"But Condita may only be wielded by the descendants of Bevler, into whose hands the spirits first gave it!"
The rapt listeners gasped in dismay. "Are there any alive today? How can we find them?"
The sage held up his fingers and began to count. "Well, I'm one. And three of you. Sorry, little Yodly. And that shepherd passing by right now." They all paused to look outside at the whistling peasant. "Then there's most of the villagers in Hurglen down the road, except for the Rundels of course. They're later arrivals. Then, if you go to Trantose, eight thousand, six hundred nine trace their blood back to Bevler. I have suspicions about a couple thousand more there. After that . . ."
The eager seekers assured the sage that they had enough candidates to get started.
Finis

Mountains and Stars

When the land was entirely flat, long ago, two clans contested for the rulership. They were the mountains and the stars, the first things that were. Their battles cannot be imagined today, but the result of them can still be seen. The blood shed then became the oceans, the mountains grew mighty, and the stars succumbed to defeat and eternal exile.
From time to time a star tests the fortitude of the mountains and finds it formidable still. Your Exile Sword is made from a brave star's corpse. It has the strength of bravery, but it can never win against a Sovereign Sword made from mountain's metal. Seek the Erosion Sword, hero, but do not be surprised if it is your own life that is worn away.
Finis

Some Science Fiction to Fantasy Conversions

Ship -> Spaceship
Deadly forest -> Asteroid belt
Dragon -> Evil corporation
Cleric -> Clerk
Magic sword -> Prototype
Intelligent talking familiar -> Robot buddy
Wizard -> Space wizard

Ys Is Simple Though

There's a redhead with a sword. Maybe he swings it, maybe he doesn't, but there's adventure either way.

Hot Enchantment Idea

Instead of talking swords, make arrows talk instead. Then they can annoy the other guy.

Addendum

I don't mean only the magic ones, but those two. Especially those. But not just those.