Take Linken's Sword to Donova Snowden in Winterspring.
You see, I have no idea how I ended up here. No one really knows -- it's a secret to everybody! I just can't seem to remember anything...
These items you brought to me, though... I am remembering something.
My sword. I am supposed to strengthen it somehow, but I'm really not sure why. Sorry I can't tell you more, but I just don't remember!
Anyhoo, I do know where you can take it -- Donova Snowden in Winterspring. You'll find her by the hot springs. She can temper the sword by the pools there.