Wither

"New Boss: The Wither. Better Craft a diaper, pal."

- The Pretty Scary Update Promo Poster

The Wither is a floating three-headed hostile mob with a skeletal appearance. It is the second boss mob, introduced in Minecraft during the Pretty Scary Update. It is Minecraft's first player-created mob to be hostile to all living mobs and the player, and is so far exclusive to the PC version.

Spawning
A Wither can only be spawned in-game using methods similar to spawning utility mobs. By placing soul sand in a T shape (as shown in the image), and putting 3 Wither Skeleton skulls on top of each three upper blocks, the Wither can be created. The last block placed must be one of the three Wither Skeleton heads; it will not spawn if the final component placed is soul sand. It cannot spawn when playing on Peaceful difficulty. Similar to all utility mobs, a Wither cannot be created by pistons. It can however be spawned with a dispenser, or with the /summon command (/summon WitherBoss). After the Wither is spawned, the sky gets slightly darker. This only occurs in the Overworld.

When spawned, the Wither will temporarily flash blue and grow larger in size as its health bar fills from half to full. While in this state, the Wither cannot move or attack and is immune to all damage. When this state ends, the Wither will create a very large explosion centered on itself, destroying nearby blocks. This explosion does not damage itself, but it will damage any nearby mobs, including the player. To avoid this, move away from the Wither after spawning it.

A ghastly sound is played when the explosion occurs. This sound is not centered around the Wither, instead it can be heard equally from all areas of the map. It can also be heard by other players throughout dimensions. Like creepers, it flashes as a warning before exploding.

Getting the necessary resources
It can be troublesome to find everything you need to spawn a Wither.

Getting Soul Sand isn't too difficult once the player manages to enter the Nether. It is extremely common, plentiful, and very easy to collect.

Obtaining three Wither Skeleton skulls is the tricky part. A few things to know:


 * Wither Skeletons only spawn in Nether Fortresses, and finding one of these involves getting somewhat lucky. To maximize your chance of getting a Wither Skeleton Skull you might want to have a sword of looting which increases the chance of rare drops in monsters. Maximize your Brightness and Render Distance (in Video Settings), and occasionally stop to peer into the distance for the large, straight columns and bridges that indicate a Nether Fortress.  Nether Fortresses spawn every few hundred meters along North-South lines, so after checking one North-South line for a few hundred meters and seeing nothing, move East or West and begin scanning North-South again.
 * Nether Fortresses are dangerous places, especially for poorly equipped players. The combination of numerous Blazes and regular Skeletons, along with the Ghasts that may opt to bombard you at any given time---all of them ranged attackers---can be deadly. The Wither Skeletons themselves inflict the Wither effect, which is a poison that can kill you. Prepare with iron armor or better, preferably enchanted, a sword, and most importantly, a bow with a steady supply of arrows.
 * Once you kill a Blaze or two and receive your first Blaze Rod, and once you find a source of Nether Wart (look near the bottoms of the Nether Fortress's interior staircases), return to the Overworld and craft yourself a Brewing Stand, then a few Potions of Fire Resistance. Their 8-minute duration makes them a worthy potion for Nether Fortress raids.
 * Wither Skeletons are dangerous foes, but they cannot pass through a two-block-high doorway. You can use this to your advantage, but it may hinder your efforts to kill enough of them, quickly enough, to account for the final problem:
 * Wither Skeletons don't spawn especially frequently, and will drop its skull only 2.5% of the time, and you need three of them (50% chance of looting 3 within 107 Wither Skeleton kills or 120 Wither Skeleton kills required on average). To reduce the required grinding:
 * A sword with Looting enchantment improves the odds that a Wither Skeleton will drop its skull.
 * While time consuming, you can mine the walls to expand the floor space, giving Wither Skeletons more space to spawn.
 * Some Nether Fortresses are better than others for spotting the Wither Skeletons that do spawn. Nether Fortresses with plenty of bridges and columns that are open to the Nether give you much better visibility, allowing you to spot Wither Skeletons further away (they don't spawn very frequently), but you will have to contend with a barrage of Ghast attacks. Conversely, a more sheltered Fortress comprised of hallways would protect you from above, but those same walls reduce your chances of spotting the Wither Skeletons that spawn.
 * If you'd prefer a different Nether Fortress, you can find them very easily: Nether Fortresses typically appear on North/South lines, so moving in either of those directions should bring you to another.
 * Potions of Night Vision also help to spot Wither Skeletons from further away.

Recommendations
To prevent anything bad from happening to any of your things, and to make it easier to battle the Wither, you should do the few things listed below.


 * Go a good distance away from your shelter, as the Wither can seriously damage any structures near it.
 * To keep your things safe from the Wither, dig about twenty-five blocks deep, and make plenty of space to spawn it and then run before the explosions begin.
 * You will probably want a source of light. Torches are almost perfect for light, but most of them will likely be destroyed by the Wither. To make it easy to see while fighting the Wither, using a Potion of Night Vision will be perfect.

In addition, there are measures that can be taken to make the fight considerably easier


 * If you've gotten to The End and killed the Enderdragon already, you may want to consider fighting the Wither in The End. If built and then run away from, the Wither should attack Endermen instead of the player, and the Endermen will fight back. When this happens, you can get the Wither to half health, grounding it so the Endermen can finish it off, or let it float above and gun down Endermen indefinitely, which, among other things, generates a considerable quantity of free ender pearls. Additionally, this will minimize damage to your surroundings, due to the high blast resistance of End Stone and Obsidian.
 * If you're still having trouble defeating the Wither, consider building an Iron Golem to assist your fight. Its high health and damage will relieve the player of some of the burden.

Behavior
The Wither is hostile to the player and all mobs except undead mobs (Skeletons, Zombies, Zombie Pigmen, Wither Skeletons and other Withers). When provoked by a skeleton or another Wither, they will only remain hostile toward each other for a moment before returning to friendly status. If spawned in the End, it will prefer to attack any nearby Endermen, but will attempt to pursue and attack the Ender Dragon if there are no nearby targets.

The Wither can become very dangerous quickly. Upon noticing a mob, the Wither attacks them with a projectile called the “Wither Skull”. Wither Skulls move slowly and inflict a status effect called "Wither"(Wither II from the boss) on Normal and Hard difficulties. This effect is similar to Poison, except that it can kill the player and turns the health bar black, making it difficult to tell at a glance how many hearts are still full. It is possible to modify the withering hearts texture to stand out better. When attacking a Player, the Wither will fly above it, making melee attacks difficult.

Each head fires independently, allowing a Wither to attack up to three different mobs at the same time. Withers need at least 4 block high airspace to fit. They can not be trapped and suffocated in smaller rooms. Every few seconds, the Wither will break any block that comes into contact with it, except Bedrock and End Portal Frames. These blocks are unbreakable by any conventional means, each having a blast resistance of 18,000,000, though in creative mode it is possible to break them.

The Wither's boss health bar is only shown when a player is looking in the direction of a Wither, and it can also be seen through walls when the player is looking in the Wither's direction. When reaching half health, the Wither will gain the "Wither Armor" effect, which makes it immune to arrows and potions, as well as having a visual effect surrounding it, similar to that of a Charged Creeper. While in this state, the Wither will only fly if angered. If calm, it simply hovers and is unable to jump up 1 block. When angered by the player, the Wither will fly at the same height as the player. Like other undead mobs (zombies, skeletons, etc.), the Wither is harmed by Potions of Healing and healed by Potions of Harming. It also regenerates over time ( every 20 ticks (1 second)).

Wither Skull


The Wither shoots Wither Skulls, which look like extra heads of itself launched as projectiles, and can keep up a fairly constant barrage of them. Upon contact, a Wither Skull will explode, although with a blast radius much smaller than that of TNT or a Creeper. If the explosion of a Wither Skull damages a mob or a player on Normal or Hard difficulty, it inflicts the Wither effect, draining their health and turning their hearts black. If the skull hits a mob or player directly, it will also heal the Wither for health. There are two types of Wither Skulls: a fast moving black one, and a slow moving blue one. Both have an explosion power of 1, the same as Ghast fireballs; however, the blue skull has special properties.

The black Wither Skull has a normal blast, which cannot break blocks with a blast resistance above 20. Thus, cobblestone and other Ghast-proof blocks will resist this blast. The blue Wither Skull is shot primarily if the difficulty is set to normal or above, when the Wither is idle, meaning the player is not within its aggro range. On average, 0.1% of the shots by the main head (when the wither has a target) are Blue Skulls as well; thus even if the wither is targeting someone, it still has a chance of shooting a Blue Skull. Although the blue Wither Skull nominally has the same explosion strength as the black Skull, it treats all blocks (except bedrock and End Portal frame) as having a blast resistance of no more than 4. This makes it much more destructive to the terrain, and lets the Wither blast away obsidian traps or shelters from a distance. The Wither can even unintentionally blast at faraway objects with the Blue Wither Skull, because if it misses, the shot will continue going until it hits a target, and may even go on forever. A Blue Wither Skull may be seen later if it flies into an unloaded chunk, and that chunk is entered by the player after killing the Wither. Note that unless the Blue Wither Skull was shot by the main head during its attack on a target (~0.1% chance), the Blue Wither Skull would be sent in a random direction.

Combat
Because the Wither inflicts a great deal of damage, having adequate gear and protection is required to defeat the Wither. Using a variety of techniques, such as suffocating the Wither in the Nether, suffocation using a cobble generator, enclosing the Wither in a room and utilizing snow golems, the Wither can easily be killed.

Trivia

 * The Wither is 4 blocks tall, 3 blocks wide, and 1 block thick, however its collision box is only 4 blocks tall, 1 block wide, and 1 block thick.
 * The Wither can be damaged by the explosions of its own projectiles.
 * Dying from the Wither effect has its own death message: [playername] withered away.
 * The Wither is unaffected by fire and lava and will not suffer drowning damage.
 * The Wither will take block suffocation damage. After the first tick of damage, it will destroy the blocks suffocating it if the mobGriefing gamerule is set to true. However, it still can't destroy bedrock.
 * There is a painting showing the soul sand and Wither Skeleton formation needed to spawn a Wither.
 * The Wither drops 50 experience, only twice the max drop for the Magma Cube (25 exp), but far behind the Ender Dragon.
 * The Looting enchantment does not affect the Wither's Nether Star drop.
 * The Wither attacks all "living" mobs such as Creepers, Spiders, Ghasts, Endermen, and the Ender Dragon.
 * The Wither will not target undead mobs (Zombies, Skeletons, etc.) and vice-versa, however Skeletons will shoot at the Wither if it is hit by a Wither skull.
 * The Wither has more health than the Ender Dragon, making it the mob with the most health points.
 * Unlike Ghast fireballs, Wither skulls cannot be hit or shot with an arrow to be redirected. If they’re shot with arrows they will explode on contact, destroying the skull and the arrow.
 * In many foreign language translations, Wither is translated to a portmanteau of "Skeleton" and "Cerberus". This is due to the fact that it has three heads.
 * The Wither can still see you when you are using the invisibility potion and will not turn invisible when hit by an invisibility potion.
 * Because the Wither is undead, Splash Potions of Healing will damage it and Splash Potions of Harming will heal it.
 * What looks like the vertebral column of the Wither is not exactly centered relative to the other part of its body: it is shifted by a half pixel on its right side.
 * In Spanish (España), the Wither is called "Eustaquio" and the kill message is translated to "[playername] sufrió una witherhostia" (literally "[playername] got witherpounded"). It is unknown if it is a joke or an oversight by Mojang.
 * The Wither is one of only five mobs that give a debuff to the player; the other four being the Wither Skeleton, the Cave Spider, the Witch, and the Elder Guardian.
 * If you use a name tag to rename the Wither, the boss meter will use that name instead of "Wither".
 * Unlike the Wither Skeleton, a Wither's eyes and mouth are both white.
 * Despite having 3 heads, only the center one will look at the player.
 * The Wither can break obsidian.
 * The wither armor does not use the "wither_armor.png" file, instead it uses the texture of the Wither's invulnerable state. It is unknown if this is a bug or otherwise.
 * The Wither's charging explosion comes from the head. Because of this, you have to cover a wither's head in water to cover its initial explosion.
 * When freshly created, the Wither is slightly smaller than when fully healed. Likewise, /summoning a wither with a high invulnerability tag can create a huge upside-down wither, which will shrink until invisible then grow the right way up. You could use the Dinnerbone nametag easter egg to turn it the right way up, however when it becomes "normal" it will be upside down.