Small Block swords
Collect Small Blocks from chests and White or Silver Slimes. Then, travel east from the castle and cross the river. Move north and use the Wire Rod to cross the river back to the west to find a small cave. Go inside and speak to the NPC on the throne to exchange the indicated number of Small Blocks for the corresponding sword.
Gorgon Sword : 5 Small Blocks.
Luck Sword : 8 Small Blocks.
Star Sword : 10 Small Blocks.
Mage Sword : 12 Small Blocks.
Katana : 15 Small Blocks.
Orihalcon : 18 Small Blocks.
Excalibur : 20 Small Blocks.