Guide artificial biomes – official terraria wiki gas works park


Usually players create an artificial forest either for fishing quests from the angler NPC that request fish specifically from the forest biome, or for farming trees and Mushrooms. Otherwise, there aren’t many other things this biome is useful for.

A Desert biome is defined by the presence of sufficient Sand blocks, in any Layer except the Underworld. Even a single block of sand can spawn desert enemies, as well as grow Cactus and Waterleaf. It requires over 1000 blocks of sand to change the background into the desert background, and the presence of sufficient other biome-defining blocks on-screen will override this background.

The Surface Jungle biome is defined by the presence of Jungle Grass on Mud blocks, but only on the Surface layer. Jungle Grass will cause the spawning of surface jungle enemies, regardless of how many tiles are present. 80 blocks of Jungle Grass, including plants that grow in the tiles above Jungle Grass, are needed to change the background and music into the Jungle biome’s natural music and background.

If you have excess mud blocks, it’s possible to build a part of skybridge out of mud blocks and plant jungle grass there. Since the trees will grow naturally there, it provides a lot of wood (and fallen stars as well) without the need to navigate through the hilly jungle terrain.

You can tell the difference between Jungle in the underground and true Underground Jungle by what monsters spawn and whether Jungle Spores grow naturally. If Hornets are spawning or Jungle Spores are visible, then it is the Underground Jungle.

A Snow biome is defined by the presence of 300 or more Snow Blocks, Ice Blocks (including pink, purple, and red variants) or Snow Bricks. This will change the background and music into the Snow biome’s background and music. Below the cavern layer, Underground Snow will be created instead.

The Hallow and Corruption biomes are defined by the presence of their respective hallowed and corrupted blocks, in any layer other than the Underworld. At least 100 Hallowed Grass, Pink Ice Block, Pearlstone, and Pearlsand defines the Hallow; tiles with hallowed plants (including 2-tile tall plants, but not trees) growing on top of hallowed grass also count. At least 200 Corrupt Grass, Purple Ice Block, Ebonstone, and Ebonsand defines the Corruption, with each tile of Vile Mushroom, Thorny Bush and other corrupted plants growing on top of grass counting. At least 200 Crimson Grass, Red Ice Block, Crimstone, and Crimsand defines the Crimson. Note that for purposes of defining a biome, each block of Crimson or Corruption will subtract 1 from the total count of Hallow blocks and vice versa.

The criteria for the Underground Hallow, Underground Corruption, and Underground Crimson are the same as for the standard versions of the biomes, with the addition of the requirement that the world needs to be in Hardmode and the player needs to be at Cavern layer or lower.

The presence of 50 meteorite ore on the screen will transform any environment into a Meteorite biome. All naturally-occurring enemy spawns will be replaced with Meteor Heads, unless this is done in the ocean biome. This works even in the Underworld.

A Mushroom biome is defined by the presence of Mushroom Grass, at least one exposed block of which will spawn Mushroom biome enemies if above the surface level of the world. At any depth, this grass will also sprout 1-block-tall Glowing Mushrooms and multi-block Giant Glowing Mushrooms. At least 100 tiles of mushrooms or mushroom grass are needed to start seeing changes to the music and background, although changing the water color in the biome may take more. Underground Mushroom Biomes do not spawn within Underground Snow or Desert Biomes.

Several biomes require that the player stand in front of a specific natural background wall to spawn the particular biome enemies. The existing biome may be enlarged, creating more space for the enemies to spawn. Background walls placed by the player will block enemy spawns.

The underground desert must be in the underground or caverns layer of the world and is found under one of the desert biomes in the world. There will be a large tunnel leading down into it from the desert biome. Despite possibly having multiple deserts a world may only have one entrance to one underground desert. The sandstone walls are naturally generated there and cannot be gathered. The sandstone walls or hardened sandstone walls(not currently in game) must be with sufficient sand, sandstone or hardened sandstone for the true biome.This attribute is similar to the spider nest and makes an artificial underground desert impossible.

The Dungeon must be below the surface level of the world, and consist of at least 250 blocks of Dungeon Brick. The player must also be standing in front of a naturally-placed Dungeon Wall — if the player removes and replaces the wall at the same location or elsewhere, it will no longer count towards the requirement, making it impossible to create artificial Dungeon biomes elsewhere.

Furthermore, for a dungeon NPC to spawn, there must also be a natural dungeon wall tile directly above a dungeon brick surface, ensuring they never appear just outside of dungeons. Being in a dungeon biome prevents any non-dungeon NPCs from spawning. So if there is no appropriate spawn surface for dungeon mobs (brick and wall), then *all* spawns are blocked.

A Spider Nest mini-biome is based on the presence of the special mottled grey/brown cave wall in these areas. Blocks in front of these walls will accumulate Cobwebs up to three tiles deep, and Wall Creepers (pre-Hardmode) and Black Recluses (in Hardmode) will spawn. It’s not possible to move or collect this cave wall, so artificial biomes can’t be created elsewhere, but a player could set up blocks in an existing nest to affect spawning / allow collection of Cobwebs.

The Underworld is defined as roughly the bottom 200 blocks of any world; at around this level, the music and background changes, Underworld enemies will spawn, and water will generally evaporate. An artificial Underworld cannot be created at any other depth.

A naturally occurring Lihzahrd Brick Wall behind the player is required for Lihzahrd and Flying Snake spawns. Thus, while the player may create spawning areas for these enemies by placing Lihzahrd Bricks, proximity to a natural Temple is still necessary. Walls placed by a player, in game, actually block (all) spawns.

Qualifying Blocks: Only blocks within a rectangular zone 50 tiles left and right, and about 43 tiles vertically, of the screen’s centre are counted towards determining active biomes. At the edges of the world, when the screen stops scrolling, this reference point no longer matches the player’s position.

When the criteria for multiple biomes are met simultaneously, there is an order of precedence for which one sets the music, background scenery, spawn rate, innocent NPC spawns, etc. However, multiple biomes may be active simultaneously. This allows, for example, the possibility of two or more Biome Key( Biome Key Mold) drops within one area.