This is a one command you can download and use.  It contains four mini-bosses and ways of spawning them in.

Info:
Armorstand on gold block for Cinder.
Armorstand on emeral block for Toxic Goblin.
Armorstand on diamond block for Ice Wraith.
Armorstand on jack-o-lantern for Grim Reaper.

*Note: Command only works for 1.9!

Report any bugs and glitches if you find them.

Thanks!

**Suggestions: Wear diamond armor with god apples when you fight them.  Otherwise you "may" die. (Certainly)

***The Command Is In Ths World Download!

DO NOT CLAIM CREDIT TO THIS CONTRAPTION.  CREDIT TO FORLORNSISU WHENEVER YOU USE IT!

My YT Channel:

www.youtube.com/channel/UC47A3qBFQj4vWXG3MhiTHjA