As you explore your world in Terraria, you may encounter special NPCs to trade and buy from. These NPCs usually have a unique requirement for spawning, and always need a valid house to move in. However, many of these NPCs can give you access to valuable renewable resources as well as access to items that can help you progress.
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For example, you can get the Goblin Tinkerer to help you change the modifiers on your equipment to ensure you have 20% extra damage or speed. You can also trade with the Steampunker to help you with your wired contraptions.
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