How do I make the Demolitionist NPC happy in Terraria?

To make the Demolitionist NPC happy in Terraria, you need to understand the NPC happiness system, which was introduced in the 1.4 update. This system allows NPCs to have preferences for specific biomes and neighbors, which directly affects their happiness. A happy NPC will offer discounts on their items and may even sell unique items that are otherwise unavailable. For the Demolitionist, his happiness is influenced by the biome he lives in and the NPCs he is near. Here is a detailed guide on how to make the Demolitionist happy.

First, let's talk about the mechanics. The Demolitionist prefers to live in the Underground or Cavern biomes. These biomes are found below the surface layer of the world, and you can identify them by the background walls and the type of blocks present. The Underground biome starts just below the surface layer and extends down to the Cavern layer, which is deeper. The Demolitionist will be happier in these biomes compared to others like the Forest or Desert.

Next, the Demolitionist has specific preferences for neighbors. He likes the Tavernkeep and the Mechanic. The Tavernkeep is an NPC that sells items related to the Old One's Army event, and the Mechanic sells wiring and mechanical items. Placing the Demolitionist in a house near these NPCs will increase his happiness. On the other hand, he dislikes being near the Goblin Tinkerer and the Steampunker. If you place him near these NPCs, his happiness will decrease.

To start, you need to prepare a suitable house for the Demolitionist in the Underground or Cavern biome. You can build a house using any type of blocks, but make sure it meets the basic requirements for NPC housing. The house should have walls, a light source, a table, a chair, and a door. You can use torches for light, and any type of table and chair will work. Once the house is ready, you can assign the Demolitionist to it by talking to him and selecting the "Housing" option.

After assigning the Demolitionist to his house, you need to place the Tavernkeep and the Mechanic in nearby houses. The houses should be close enough so that the NPCs are considered neighbors. You can check the housing menu to see if the NPCs are assigned to the correct houses. If the Demolitionist is happy, you will notice that his prices are lower, and he may sell unique items like the Bomb Statue or the Explosive Powder.

There are some important tips and considerations to keep in mind. First, make sure that the Underground or Cavern biome is not corrupted or hallowed. Corruption, Crimson, and Hallow can spread and change the biome, which will affect the Demolitionist's happiness. You can use the Clentaminator to purify the area if needed. Second, avoid placing the Demolitionist near NPCs he dislikes, as this will decrease his happiness. Third, make sure that the houses are not too far apart, as the NPCs need to be close to each other to be considered neighbors.

Common mistakes to avoid include placing the Demolitionist in the wrong biome or near NPCs he dislikes. Another mistake is not checking the housing menu to ensure that the NPCs are assigned correctly. If the Demolitionist is not happy, you may need to move him to a different house or adjust the placement of other NPCs.

Advanced techniques include optimizing the placement of NPCs to maximize happiness for multiple characters. For example, you can create a small town in the Underground biome with the Demolitionist, Tavernkeep, and Mechanic living close to each other. This setup will keep all three NPCs happy and provide you with discounts and unique items. You can also use teleporters to quickly move between different parts of your world, making it easier to manage NPC housing and happiness.

Resource requirements and preparation include gathering materials for building houses, such as wood, stone, and torches. You may also need to gather materials for crafting furniture, like tables and chairs. If you are playing in a world with Corruption or Crimson, you may need to gather purification powder or use the Clentaminator to clean the area.

Class and equipment considerations are not directly related to NPC happiness, but having the right gear can make it easier to explore and build in the Underground biome. For example, a pickaxe with high mining speed will help you gather materials quickly, and a grappling hook can help you navigate the terrain. If you are playing as a ranged class, you may want to stock up on explosives, which the Demolitionist sells.

In specific scenarios, you may need to adjust your strategy based on the layout of your world. For example, if the Underground biome is too far from your main base, you may need to create a secondary base near the Demolitionist's house. This will make it easier to access his shop and manage his happiness. You can also use platforms and ropes to create pathways between different parts of your world, making it easier to move NPCs and resources.

In conclusion, making the Demolitionist happy in Terraria involves placing him in the Underground or Cavern biome and near the Tavernkeep and Mechanic. Avoid placing him near NPCs he dislikes, and make sure the area is not corrupted or hallowed. By following these steps and considering the tips and strategies mentioned, you can keep the Demolitionist happy and take advantage of his discounts and unique items.