NPC

300px|right A Non-Player Character (NPC) is an automated character that provides a service to players. Most NPCs are vendors, selling items in exchange for coins, and vice versa. Exceptions are the Guide, who provides information, and the Nurse, who provides health restoration in exchange for coins and the Dryad who can tell you how corrupt your world is. A player can utilize NPCs by standing near and right-clicking on them.

Spawn Conditions
To spawn all but three of the 19 NPCs (the Guide, the Old Man, and the Travelling Merchant) the player must build a suitable home. This consists of a light source, flat surface item, and comfort item enclosed by blocks with a door or platforms to access the outside and proper walls. Furthermore, each NPC has one other unique requirement for spawning, which are listed below (more information in the home page). This doesn't exclude the guide, who still requires the same to respawn should he die. NPCs will not spawn during an event or if the house is in an area affected by to much corruption. NPCs will only spawn during the daytime. All NPCs except Santa Claus and Old Man have randomly generated names.