The Cave of the Dog, located north of Lakanaba, is a pivotal dungeon in Chapter 3. Your objective is not just to find the dog, but to use it to navigate the Fox's Den in the northern woods. By bringing the dog to the village of Foxes, you break an illusion, allowing you to obtain the Full Moon Herb. Trading this herb back in Lakanaba secures the retrieval of an architect who can repair the bridge to the south, which is essential for personal progression towards Endor.
The core of Torneko's journey is a specialized trading mechanic centered in Endor. Rather than general selling, you must capitalize on supply and demand. The most efficient way to acquire the 60,000 gold needed for your own shop is by fulfilling a contract for the Endor Royal Family: delivering 6 Steel Broadswords and 6 Iron Armors to the fort commander. This payout, combined with the "Cautery Sword" flipping method—purchasing them in Lakanaba and selling them to the collector in Endor—is the fastest route to the goal. Once you pay the 60,000 gold to the old man in the Endor shop, you transition from a traveling merchant to a shop owner, enabling you to hire employees and fund the construction of the Trans-Elemental Tunnel. Financing the final 60,000 gold for the tunnel workers marks the completion of the chapter.