Minecraft has quite a few boss mobs that have made their place in the game very well known to players. The Enderdragon rules over The End, while the Warden haunts anyone who ventures into The Deep Dark. There is only one boss in Minecraft that you must actively summon who can cause widespread destruction around the overworld. Here is how to summon The Wither in Minecraft.
Related: How to find the Warden in Minecraft
How to summon and defeat The Wither in Minecraft
To summon The Wither, you need to acquire four Soul Sand/Soil blocks and three Wither Skeleton Skulls. Both items can only be acquired in the Nether. Soul Sand and Soil is scattered randomly throughout the realm, but you can find biomes filled with the stuff. If you find a Nether Fortress, you can grab it underneath Netherwart gardens.
The Wither Skeleton Skulls are what will take the most time for you to acquire. Wither Skeletons appear in Nether Fortresses. When you find them, you need to defeat them for a minuscule chance at the item dropping. You can slightly increase it with the Looting enchantment put on your weapon, but it is still a less than 6% chance.
When fighting Wither Skeletons, be careful about them touching you. If they damage you, your health bar will go black and slowly fall until you die. If you have a Bucket of Milk on you, you can eliminate the effect.
When you have the four Soul Sand/Soil blocks and three Wither Skeleton Skulls, you are ready to summon The Wither. Be sure you are ready for a fight because this will be challenging. Place your Soul blocks in a T and place the Skulls on top of them. The Wither will appear and build up its health before causing an explosion around it and then attacking any players or NPC mobs in the area.
Defeating The Wither will be quite difficult. Whenever it glows blue, it is charging up an explosion. It will fly around and fire explosive skulls at you, so getting close to it can be both challenging and dangerous. If you are able to endure its attacks and defeat it, it will charge up for one more large explosion and always drop a Nether Star for you to use on creating a Beacon.