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.