If you play Minecraft a lot, you have probably beaten the ender dragon and wither various times already, and they may seem easy. However, using cheats and creative mode enabled, you can make an ultimate boss as strong as you like.

Here are steps:

1. Choose boss mob: Ender dragon / Wither. I’ll do wither in this tutorial.
2. Hold it still: Make sure it will stay still so the commands always reach it.
3. Add buffs: Add effects and other modifications to make it stronger.
4. Other Modifications: Add any other required modifications to the terrain or environment.
5. Summon boss mob: The modifications will automatically apply to it if you entered correct commands.
6. All set: Turn yourself on survival and battle the mob.

Choose boss mob: I’ll be using a wither in this tutorial. It’ll be essential to choose first so you can place the correct commands in the command blocks. Even though you’ve chosen already, don’t spawn it yet.

First, you’ll need a command block. Basically the only thing you’ll need. Use the command:

/give @s command_block 1

Hold it still:

That gives you a command block. Paste it into chat and run it. Congratulations, you have a command block. Place one down where you want the wither to be. The wither will be 5 blocks above where you place down the command block. Right-click into it, and paste this into the command box:

/tp @e[type=wither,r=10] ~~5~

Also, the settings on the side should be changed to: Repeat, Unconditional, Always Active.

Now, go to your inventory and get a wither spawn egg. [Part of the new update, cool, huh?] Anyway, place down an anvil and rename the wither spawn egg to the name of your boss that will show above the boss bar.

Go to the command block. Right click the wither spawn egg on top of it; it will summon the wither. If you’ve done all the steps correctly, the wither should immediately teleport a few blocks upward. The name above the boss bar should also be whatever you customized.

Add buffs:

Now place down a command block. Turn it Repeat, Unconditional, Always Active. In the command line:

/effect @e[type=wither,r=10] instant_damage 1 0 true

[Note it’s instant_damage instead of instant_health – that’s because he’s undead and will heal to instant damage]

Scroll down on the side where you change the Repeat, Unconditional, and Always Active settings. You should find something that says Delay, or Tick, with a bar that has a 0 in it. If you do not change this, the wither will be invincible, regenerating his health in a so short duration any damage inflicted is automatically regenerated. If you want the boss to be extremely hard, put his tick count as 5. If you want it to be medium, put it at 15. Easy? Put it at 30. The more delay it has the more time between each regeneration.

Other modifications:

Since the wither will be staying in one place, he will destroy the terrain around him, digging a hole so players cannot reach him. Let’s prevent him from digging a hole by using this command:

/gamerule mobgriefing false

This means that any mob cannot break blocks with its explosions, like creepers or the wither, or an enderman picking up blocks and moving them around.

All set:

Get some gear, turn yourself on survival mode, and it’s time to kill that wither!

NOTE:
If you or someone else kills the wither you can always respawn another one with the spawn egg you used, or you can get another wither spawn egg and rename it to something different as a different boss.