The only NPC who likes staying in the mushroom biome is the Truffle. Since only the Dye Trader likes desert, this is pretty much the only way to go to get this pylon. The desert pylon can be obtained by putting the Dye Trader with either the Painter or the Arms Dealer in the desert biome.

You can replace the Cyborg with the Goblin Tinkerer for slightly better results (if, for example, you have a bit too many NPCs in the area). If you put those two NPC in the snow biome, the Mechanic should sell you the pylon. Alternatively, you can put the Pirate and the Tavernkeeper together.ДЄs its name suggests, the snow pylon can be bought in the snow biome, home to the Mechanic and the Cyborg. Luckily, the Pirate likes staying near the Angler, so you can use those two NPCs to get the Ocean Pylon. The NPCs that prefer to stay in these biomes are the Stylist, the Angler, and the Pirate. The ocean pylon can be bought in the ocean biome. The only differences are in how they appear (based on the biome they were bought in).Д®very NPC likes the Princess, so she can be a wildcard for you to get the pylon anywhere you want, provided you put an NPC that likes that domain. All pylons function the same, with one exception. Once youвЂ™ve pushed an NPCвЂ™s happiness far enough, they will sell you the pylon for some gold.Д®ach pylon has several possible combinations, but we will discuss only a few that will provide the best results. Mastering the вЂњHappiness SystemвЂќ and moving NPCs around so they stay in suitable biomes and close to other NPCs will be crucial in obtaining these precious items. After that, you can put a single NPC that they like close to them and that should give them enough happiness to sell you the pylon for that biome.

Putting an NPC alone in the biome they love will get you most of the way towards to threshold needed to buy a pylon. For example, if there are more than four other NPCs in the area, any happiness bonuses from living with a liked neighbor are mostly negated. The system also considers possible overcrowding and adjusts happiness levels accordingly.

Terraria npc happiness