Wither – Official Minecraft Wiki
The wither rapidly fires explosive projectiles called wither skulls, which look like extra heads of itself, at its target. There are two types of wither skulls: a fast-moving black one, and a slower blue one. Black wither skulls explode with a blast power of 1, the same as a ghast's fireball, and cannot break blocks with a blast resistance above 4. The blue wither skull has the same explosion strength, but moves slower and treats all blocks except for a few "unbreakable" blocks as having a ...
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