Underground Castle 4 Wandering Merchant Guide Introduction to the Trading Mechanism of the Wandering Merchant in Underground Castle 4

In Underground Castle 4, the wandering merchant is a core NPC for obtaining rare equipment, consumables, and quest items. Their inventory directly affects players' resource planning and quest progression efficiency. Next, we will introduce the trading method of the wandering merchant in Underground Castle 4. In fact, merchants are distributed across the maps of each chapter and have a cross-regional item switching function. However, once some key items (such as shovels) are sold out, they cannot be restocked, so it's important to carefully plan the purchase order.

The first merchant is located near the stone pile on the northeast side of the Frightened Wilderness, close to the resource point but easily obstructed by the environment. If you need to submit a quest item (such as the white altar candle quest), make sure to carry the item in your backpack and approach the merchant to trigger the interaction interface. This merchant sells key items like shovels, which are recommended to be purchased first due to limited stock and high demand for subsequent excavation tasks. If the interaction fails, try adjusting your position or reloading the map. Some main quests (such as the cemetery exploration) require interacting with the merchant to advance the plot. If the quest gets stuck, check if you have missed submitting an item or failed to trigger a dialogue. A translucent state of the merchant indicates that they can be interacted with, and quests like the polymorph event require visiting the same location for two consecutive days to complete.

The Chapter 2 merchant is located within the abandoned building complex, requiring a torch for illumination. After entering, use the left-side interface switching function to view the inventories of merchants from other chapters, eliminating the need to repeatedly run around. Among the items, potions and scrolls offer good value for early storage, while equipment should be chosen based on the character's class to avoid wasting gold. To unlock hidden levels (such as the Silent Village), specific maps must be purchased here.

After finding any merchant, you can switch between different chapter merchants' item lists through the left menu. This feature significantly saves exploration time, but note that some items (such as shovels and lock-picking tools) share a global inventory, and once sold out, cannot be replenished. It is recommended to prioritize purchasing shovels for ore mining and then select other props based on main quest needs. When gold is limited, you can forego low-quality equipment and focus on high-value consumables.

Besides offering some key items, the wandering merchant in Underground Castle 4 is not much different from ordinary traveling merchants in other games. However, the prices of merchant goods fluctuate greatly in the mid to late game, so it is advisable to keep some gold reserved for high-level equipment needs. Efficient use of the wandering merchant can greatly improve the smoothness of exploring Underground Castle 4. Mastering the location patterns and reasonably allocating gold ensures a steady supply of key resources.