Minecraft Add-ons

An entity that has 3 different forms and up to 5 different attack styles. Would you dare to fight it? Or you'll just leave it alone?

My simple addon creation. A simple entity that duplicate itself within just a seconds. And will be uncontrollable when being uncared. I don't know the reason why it can't be killed by /kill command, maybe it's just a bug on mine, but you could try if you can kill it with this command.