In this addon, I add a mob - Target Box and a block - Target Box Spawner.

-Target Box Spawner

This is a spawner for Target Box. If you want to spawn Target Box, just place the block.

Crafting Recipe:

Normal

Easy

Target Box

Health: 50 heart

Teleport: like a shulker box

This mob will be attacked by every mob that will attacked player.

Here is some screenshot

You can use Target Box to:

-Make a mob farm

-Test your weapon

-Attract the monster to let you escape form them.

That all my addon. If you find any bugs, please tell me in the command.