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This guide is a simplified overview of all the changes in the Pretty Scary Update (Java Edition 1.4.x releases), which assumes at least some knowledge of the Java Edition 1.3.x releases.
Can only be spawned by placing 4 blocks of soul sand in a T shape, and putting 3 wither skeleton skulls on top of the three upper blocks (see image below).
After spawning, it flashes blue, builds up health, grows slightly and is invincible for a few seconds - Then it explodes and starts attacking players and mobs
Each head can fire projectiles, so-called wither skulls, at different targets
Shoots two kinds of projectiles - a blue one from the little heads, targeting mobs and a dark one from the big head targeting players
When hit by projectiles, players get the wither II effect, which acts like a slower Poison effect that can kill and turns affected players' health bars' hearts black
Adding more gunpowder increases the duration of the rocket. Up to three gunpowder can be used. Up to five firework stars can also be used with three gunpowder. Up to seven firework stars can be used by using firework stars instead of additional gunpowder. All firework stars explode almost simultaneously when the rocket detonates.
Projectiles which can be launched into the air and explode.
Gunpowder + Matching Dye + Extra ingredients (optional)
Up to eight dyes can be added. One head, gold nugget, feather, or fire charge can be added. Both the diamond and the glowstone dust can be added with any of the other ingredients.
[Bedrock Edition and Minecraft Education only] Up to eight dyes can be added. One head, gold nugget, feather, or fire charge can be added. Both the diamond and the glowstone dust can be added with any of the other ingredients.
[Bedrock Edition and Minecraft Education only] Adds a "fade to color" effect to the firework star, overwriting any existing fades. Up to eight dyes can be added.
Used to determine the color and shape of firework explosions.
Added a new painting depicting the creation of the Wither.
This is the only painting not based on a real painting by Kristoffer Zetterstrand, and is also the only painting to have been added in a post-release version so far.