Wither

"New Boss: Wither! Better craft a diaper, pal."

- The Pretty Scary Update promo poster

The wither is a boss mob that shoots explosive skulls at the player. It drops the nether star, which can be used to create beacons.

Spawning
Withers are spawned by placing soul sand in a T shape (as shown in the image to the left), and putting 3 wither skeleton skulls on top of the three upper blocks. The last block placed must be one of the three wither skeleton skulls, and can be placed by the player or a dispenser. Air blocks are required on either side of the base soul sand block under the upper blocks. The building pattern can be configured upright, sideways, or upside-down; the skulls can also have any orientation.

Like other hostile mobs, the wither despawns when the difficulty is changed to Peaceful. The wither spawning structure will also fail in Peaceful difficulty: the blocks will simply do nothing.

Drops
The wither drops 1 nether star upon death which, until picked up, won't despawn or be destroyed by explosions. The Looting enchantment will not increase this drop. It also drops 50 experience when killed by a player or tamed wolf.

Behavior
"This undead triple-headed creature will then immediately attempt to destroy every living thing in the vicinity, spitting out skulls from each of its three heads and inflicting a creeping corruption on their target which turns a player’s hearts an unhealthy black. In its fury, the Wither will destroy blocks it comes into contact with - even if you survive the battle, there’s often precious little left standing nearby."

- Marsh Davies



When spawned, the wither will grow larger in size as its health bar fills up. While in this state, the wither is invulnerable, and will not move or attack. When this state ends (after 10 seconds), the wither will create a very large explosion centered on itself, destroying nearby blocks and damaging nearby mobs/players. After this, the wither will attack nearby mobs and is now able to take damage.

The wither is immune to fire, lava and drowning damage. Suffocation is ineffective, since upon taking damage, the wither will break any block that comes into contact with it (except bedrock, end gateway blocks, end portal blocks, end portal frames, command blocks, barriers and piston extensions). Like other undead mobs, the wither is harmed by healing potions and healed by harming potions; however it is unaffected by any other status effect.

The wither is hostile to the player and all mobs except undead mobs ( Skeleton,   Undead Horse,, ,    Zombie, ). The wither is unaffected by all attacks from undead mobs except other withers' skulls.

If the wither is calm, it simply hovers and is unable to gain altitude. On Normal or Hard, it will also randomly fire blue skulls in random directions until it finds a target.

The wither has a dark purple boss health bar which is only shown when a player is looking in its direction, including through walls. When looking at the wither, the sky gets slightly darker. All withers will display a boss bar on the screen.

Java and Console Editions


Upon noticing a mob, the Wither hovers above it and rapidly shoots projectiles called “Wither skulls”. Each head fires independently, allowing a wither to attack up to three different mobs/players at the same time. The main head controls the Wither's movement, and has a 0.1% chance to shoot a blue wither skull instead of the default black one.

The wither has a passive regeneration rate of every 20 ticks (1 second), and a direct hit on a target instantly heals.

When its health drops below half, the wither will gain the "wither armor" effect, which makes it immune to arrows and causes it to only fly at the same height as its target. The armor will disappear if it regenerates above half health.

Bedrock Edition
Upon noticing a mob or player, the wither will fly to a random location and hover in place. It will shoot 3 black wither skulls and a blue wither skull before flying to another location.

At half health, it causes an explosion that spawns 3-4 wither skeletons (except on Easy difficulty), as well as gaining "wither armor". Instead of flying to a random location, it will now dash towards its target like a missile, destroying most blocks and damaging mobs in its path. The wither prioritizes to attacking the player who can deal the highest attack damage. It also has different birth and death animations, both of which involve the wither spinning and exploding.

Wither skull
The wither shoots wither skulls, which look like extra heads of itself launched as projectiles. If a wither skull hits a mob/player on Normal or Hard difficulty, it inflicts 40 seconds of Wither II effect (which drains their health and turns their hearts black). If the player or mob already has the Wither effect, the remaining time of the effect is lengthened instead of overridden, which means players can suffer from the Wither effect for minutes after they are hit by many wither skulls in succession.

There are two types of wither skulls: a fast moving black one, and a slow moving blue one. Black wither skulls explode with a blast radius of 1, the same as a Ghast's fireball, and cannot break blocks with a blast resistance above 20. The blue wither skull has the same explosion strength, but moves slower and treats most blocks as having a blast resistance of no more than 4, making it more destructive to the terrain.

On Bedrock Edition, the blue skull can be redirected by hitting it with a sword or arrow (similar to Ghast fireballs).

Wither skulls are also entities which have associated entity data. Their entity ID is.

Data values
Withers have entity data associated with them that contain various properties of the mob. Their entity ID is.

Trivia

 * According to Jeb, Wither was inspired by Terraria which has summonable boss mechanic, the name itself inspired by poison spell in another game made by him called Whispers in Akarra.
 * There is a painting showing the soul sand and wither skeleton skull formation needed to spawn a wither.
 * The wither can see players/mobs under the Invisibility potion effect.
 * The wither does not take damage from undead mobs' attacks or from drowning.
 * If the wither is damaged by the Void, it will frantically attempt to fire blue skulls.
 * If the wither is after a blaze and the blaze tries to fly up to it, the wither will attempt to keep rising above the blaze, thus making both of them rise higher until they hit a ceiling or until the blaze despawns.
 * Although the wither is 3.5 blocks tall, 3 blocks wide, and 1 block thick, its hitbox is only 3.5 blocks tall, 1 block wide, and 1 block thick.
 * The true dimensions of the wither are: 2.844 blocks tall (varies), 3 blocks wide and 1.719 blocks long (also varies).
 * A variant of the wither called the Friendly wither was in two of the April fools updates.
 * The wither spawn structure can be built any way, such as downward or horizontal, however the wither will always spawn at the foot of the structure.
 * The wither appears on four sides of chiseled red sandstone.
 * Withers have the greatest natural health of all vanilla mobs in Minecraft, making it brawnier than even the ender dragon. The wither, however, is slower and deals less damage than the ender dragon.
 * The wither's smaller heads shoot targets slightly slower than the main head. the interval for smaller heads is 2-3 seconds, while the main head's always 2.
 * An enemy called the Wither Storm appears in Minecraft: Story Mode. It was created by replacing the center block of soul sand with a Command Block.