Here's a little random command I made that tests out some particles and summoning commands. The boss has awesome particles floating around him, and he might drop his head. Careful where you spawn him; he'll blow up a bit! This guy has 300 health with a full pack of diamond armor. If you aren't wearing any armor, he'll kill you in just two hits. The good news is that if you keep hitting him, he can't hit you. He's also very slow!
First, you must give yourself a command block (If you are on a server, you must be 'OP'ed, and have access to /gamemode 1)
To get a command block, type /give @p command_block in the chat.
Once you have a command block, right click it to open it's GUI.
Now, you must copy and paste the command from your browser into the game. Select the entire command from below, then right click and press 'copy'.
Next, go back to your minecraft world, and paste the command you just copied into the command block. There are a few different keys that may be used to do this, depending on your keyboard. The most common ones are 'CTRL + V', 'COMMAND + V', or 'STRG + V'
Finally, you can press done to exit the GUI, and execute the command block by powering it with a redstone block, a lever, or any thing you can get your grubby hands on. Just make sure you don't place it on top of the command block, or the machine will not be installed!
i know you may be frustrated with me right now, but when i saw this it made me want to make my sort of bossssssssssssssss..... BOOM, get the hint, anyway is it ok if i make a creeper boss kinda like this i will give you credit for the idea.
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-Squid