Item IDs
Note that not every item has its own ID; these are differentiated via their names. They're listed anyway for completeness' sake. See Item IDs for a list of all item IDs.
 NPC IDs
See NPC IDs for a list of NPC IDs.
 Buff IDs
See Buff IDs for a list of all Buff IDs.
 Projectile IDs
 Tile IDs
See Tile IDs for a list of Tile IDs.
 Wall IDs
 Prefix IDs
 Questions and answers
 A Mob/Item is missing from the list! What can I do?
This means that either the item/monster is saved in the Terraria client with its name, instead of ID, or it was added in a recent update and the page hasn't been updated yet. For example, items such as Gold Pickaxe and monsters such as Pinky and a few other colored slimes, are saved with their name, and can't be indexed with an ID.
 What do I need these IDs for?
Basically, these IDs are used to index monsters, items, buffs, projectiles, prefixes and tiles in Terraria. They may be useful if you are developing clientside mods or texture packs or serverside mods like TShock (i.e. if you are working with the game's code). In Terraria's sprites some of these are labeled by ID so it makes finding those easier as well.
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