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This is a small mod that adds exactly one item: a Target Dummy.

The dummy can be placed in the world, where it'll stand silently, judging your every action. It'll wiggle funny if you hit it, screaming large numbers of damage at you. It can be dressed up to look even more awesome. This will please the dummy, making the numbers smaller.

TL;DR: target dummies show damage dealt to them and can be equipped with armor

 

Usage:
Right click on a block with a target dummy to place it. He can be rotated 16 different directions depending on the way you face when you place it, similar to an armor stand.

You can start dressing the little dude with all kind of armors and equipment. Just right click him with the desired item. To unequip a certain armor piece just click on his corresponding body part.

Got tired of testing your dps? You can remove the dummy just by shift left clicking him with an empty hand!

 

Additional features:
Have you ever wanted to test your new smite sword but couldn't because there are no skellies around? Well fear no more, you can now equip the dummy with and undead mob head and it will change its type accordingly!
Similarly you can equip him with a turtle helmet to make it a water mob or with a pillager banner to turn it into a pillager mob. Note that he still won't be attacked by other mobs (maybe it a future update), he'll just take more damage from appropriate enchantment and so on.

 

 Need automating? You can dispense the dummy using a dispenser and you can break him by removing the block under his feet.  

 Don't like how much he swings or the new skin? Well you can easily change that by using the mod config file. You can additionally choose between static and dynamic dps messages and you can make the numbers show hearths instead of damage.
Try shearing the dummies to get a different skin!

 

You can also equip them with a pumpkin or jack o lantern and they'll act as scarecrows, scaring nearby animals  

 

Full list of changes from original 1.12 bonusboni's mod:  

Lots of stuff here, more than half of the mod was re written.

New skin!
Added support for more than one damage number. They now have a fading animation to clarify which is the newest.
Numbers change their colors depending on the type of damage dealt. For example critical hits are red and lightning damage is yellow. Try it out!
Added dispenser support
Can mimic mob types by equipping different items.
Updated the model and animation so that the head stays attached to the body
The dummy now reacts to all damage types
Can be killed with /kill command, by withers and by void damage.
Dps number now appears on the status bar. You can choose between static and dynamic dps in the config.
Added configs to change a few aesthetic things
Equipping and unequipping functions alot more like an armor stand
Base is a bit smaller and centered on the block grid
Custom armor models from other mods render properly (only 1.16 for now)
Swinging animation is not much smoother
Act as scarecrows when equipped with a pumpkin
Fixed some bugs