Pylons

Pylons are furniture items. They allow a player to teleport to any other pylon with the following restrictions:
 * Pylons can only be used when there are 2 or more housed NPCs nearby.
 * Pylons are only practical if there are 2 or more in the world. The system they form is known as the pylon network.
 * Pylons only function when in the matching biome.
 * Only one of each type Pylon may be placed in a world.
 * The pylon network cannot be used during Boss battles or when invasions are announced or in progress.
 * You cannot use a pylon if the area it is in is a Graveyard.

Pylons are sold by NPC vendors, and have interactions with the Town mechanic. The pylon can be sold by every NPC in the biome, as long as they have high enough happiness. Every NPC has a specific biome preference, and building a house for them in their preferred biome increases happiness.

Types
Pylons have a corresponding biome. They may only be sold by NPC vendors who are living in that biome. Additional requirements before pylons will be sold may include number or happiness of NPCs in the area.

NPC Happiness and how to change it

 * Main article: NPCs § Happiness

Pylons are sold by vendor NPCs when their happiness is high enough. The main ways to change an NPCs happiness are:


 * House them in the biome that they like.
 * Ensure that only one other NPC is housed in the same Town, or they love (not like) at least one nearby NPC.

These two alone will get the NPC happy enough to sell a Pylon. Remember that having more than 3 NPCs or any NPC they dislike in the same Town, or being located too far from their home or in The Corruption, The Crimson, or the dungeon, will make them too unhappy to sell one. The exact factors are listed on the NPCs page.

Trivia

 * NPCs sell pylons based on the biome the player is in, not the biome the NPC is in.
 * Multiple pylons can be sold simultaneously if the player is in a hybrid biome.