Sana is an NPC that is only alluded to in text and has never been seen in-game.
When a player has the Running Boots in their inventory and asks the Innkeeper about them he says "Those boots were made a long time ago by an outfitter named Sana. Sana made many other things, but her claim to fame were her boots. No one is quite sure how she did it. They are remarkably light and agile, allowing the wearer to move with greater speed. "
- Currently there are no other items known to have been created or invented by Sana.