Hey, guys! 
Recently, I finished my turtorial for exploding snowballs, where the snowballs hit the ground, then explode, but now it's time to show you one of my kits for a game I am creating: Super Smash Mobs.
Yeah. I know.
"You copied it from a ton of other people! You're a cheater!"
That's probably what you're gonna say.


But my work is completely original, only with the inspiration from Mineplex (a server) and SethBling, to prove that it is possible to complete in vanilla minecraft. One of my kits in the minigame is called the Wither. To be able to have perks like that, here is the turtorial:
1st Step: Clocks
You have to set clocks for all of this to work. I did a 1x1x6 dimension of a clock, though you could expand it. we don't need all of them, but just keep them there in case. The structure of the clock is up on there. The command blocks you see on the sides with the names Clock 1 and Clock 2 are basically like this. Insert into clock 1:



For the 2nd clock part, insert this:



Then lay out the redstone blocks as shown above.

2nd Step: Scoreboard
Every minigame has to have a score! But this time, it's completely necessary to have it. First, do:
/scoreboard teams add Wither 
Then, do:
/scoreboard teams join Wither
Done!

3rd Step: Commands-on-clock
Notice command blocks 1, 2, and 3. You see how all of them are on the redstone blocks? That means they're being constantly activated, never stopping unless you destroy the redstone block between the clock parts. Don't do that, btw.
Insert into command block #1:



Insert into command block #2:



Insert into command block #3:



The first command should teleport all WitherSkulls to all arrows (I'll talk about that in a second) and the second one should leave a trail of white spell curls after the arrow. That isn't needed, but it's a cool side effect. The 3rd command block should give all arrows a radius of 3x3x3, and anyone in that section would get a wither IV for 3 seconds.

4th Step: Sequence
Lastly, the sequence. I saved this for last, because it's the one that requires most redstone—remember, I'm not a good head for redstone, just command blocks. Anyway, the 4th command block (the number 4 written on the image) should have this in it: 



The 5th command block should have:



(now, the obsidian isn't random, as it said on the image. It's for blocking the WitherSkull from blowing up everything if something goes wrong.)
The 6th command block should have:



Done!