The Nether, also referred to as "The Nexus" in Notch's Blog on Tumblr, sometimes called "Gate to Inferno Fields" and was previously known as Hell and The Slip, is part of the Minecraft Halloween Update. It exists in a completely different world from the Overworld. The terrain is dimly lit, full of Lava streams flowing from the ceiling, sudden cliffs, and lava lakes, making it extremely dangerous to explore. The ceiling and the base of the Nether are made of Bedrock. Mushrooms are also commonly found. If the player dies in The Nether, they will be transported back to the spawn point in the Overworld. Maps can be made of the Nether, but they can only be created while there. If a player brings a map of the Overworld into the Nether it will stay the same but the marker that represents the player will be absent. Also, sudden bridges and shafts can be found through out the randomly generated world. You will most likely find the bridge partially destroyed, and the shaft is located near lots of enemies, so watch out.
The portals are made by creating a 4x5 (2x3 on inside) door frame out of Obsidian and then lighting the inside of the frame on fire with Flint and Steel or a Fire Charge. The corners of the frame may be left out, using only 10 obsidian as apposed to the usual 14. When you stand inside the portal for the first time, it will create a portal in its equivalent area of The Nether. A loading screen will appear during the change of worlds.A portal can be shut down if part of the obsidian frame is removed.
When re-entering the Overworld, any distance covered in The Nether is multiplied by 8, effectively making The Nether a fast-travel zone that allows for greater distances to be covered in a short amount of time in the Overworld.
Walking through a portal will not teleport the player―in order to use them, the player has to stand still inside the purple haze. Currently, they will not transport mobs or minecarts. Attempting to go through a portal while in a minecart will result in the player needing to restart the game to continue.
Mobs and Enemies
Mobs that spawn in the main world do not appear here, except Zombie Pigmen which appear in the Overworld when Pigs are struck by lightning. Instead, there are special mobs that appear only in The Nether (although Ghasts have an extremely small chance of spawning through a portal on the surface world.)
- Ghasts ― Flying jellyfish-like 4-meter-sized monsters that shoot fireballs. They can be damaged by any conventional weapons, but they do not get hurt when on Fire, only when touching it. A Ghast can fly into lava falls or lava lakes, but even if they burn they don't get damaged (As of the November 10th Update). The fireballs they shoot can be deflected back at them using a fist or any tool by hitting it just before impact (shooting an Arrow or using the Fishing Rod on the fireballs works too). They drop Gunpowder and Ghast Tears. Ghast fireballs do not destroy Cobblestone. Most people when building a fort or house in The Nether use Cobblestone to create a safe place.
- Zombie Pigmen ― Neutral, humanoid creatures that turn hostile when attacked. They now drop Rotten Flesh and Gold Nuggets when killed. They wield Gold Swords, and cause 2.5 damage. Attacking one causes all nearby Zombie Pigmen to attack you too, just like Overworld´s Wolves. Immune to both Fire and Lava.
- Blaze ― A hostile mob that appears in Nether Fortresses. They shoot 3 fireballs like a Ghast, although they do not cause explosions on impact. They drop Blaze Rods. Blazes cannot shoot when thier Fires are out, they can re-light thier Fires eventually or instantly if they touch Fire or Lava.
- Magma Cube ― The nether's equivalent of a Slime. When Magma Cubes jump they will show their layers. They can also set the player on Fire. Immune to both Fire and Lava.
Blocks can be brought to and from the Overwworld. So far, there are six block types only found in The Nether:
- Netherrack- This block burns indefinitely, and is the main block type forming the Nether. Setting these on Fire while travelling in The Nether is a great way to save on Torches.
- Glowstone- A golden block that glows indefinitely, commonly found as stalactites on the ceiling of the Nether. These can be used as a light source underwater in the Overworld, and the Glowstone Dust produced when it is mined is an ingredient in making Potions and Redstone Lamps.
- Soul Sand- A brown block. When walked on, it slows the movement speed of the player and mobs that walk across it, and makes them sink down a tiny bit. It can be used to create minecart-only passageways and docks, aswell as one way doors. It's slowing effect is doubled if an Ice block is placed under it.
- Nether Brick- A dark purple stone that superficially resembles bricks. Nether brick can be used to make Nether fence, and can be broken easily with a stone pickaxe. It can be found in the Nether, specifically in strongholds.
- Nether Brick Fence- A dark purple fence. It can be mined in the Nether strongholds, or can be created from six Nether fence pieces.
- Nether Brick Stairs- A dark purple stair. It can be mined in the Nether strongholds, or can be created from six Nether Bricks.
Water cannot be brought to the Nether due to the fact that all water placed will evaporate immediately due to the extreme heat and will instead turn into steam. However, you will have no problem placing lava in the Nether and placing an ice block will have no effect. Breaking the ice block will somehow let water into area.
- If a Bed is placed at The Nether and is right-clicked on, it will explode with a lethal blast radius (unless the player has enough armor).
- Due to how the building height limit of the game was changed to 256, and the top bedrock layer still spawns at 127, in creative it is possible to get above the bedrock layer and build on top of the nether.
- If you bring a bucket of water into the nether it'll dry up before you can use it.
- (Using mods) if bringing ice and breaking it, water doesn't dry, it just leaves a stream of water.
- The Dangers of the Nether are severly reduced in the 360 version such as No blaze, Magma Cube mobs, very little spawning of Ghasts and No Nether Fortresses.