First we have mutant wither skeleton have 2 attack and wither effect health its 150 and the damage its only 23. Here the picture 

Now he is have a brutal skull attack skull 

Next 

We have mutant hoglin health 200 and damage its 18 have 2 attack and 1 special attack or slam attack it have some critical damage  and now he gas a death animation like on the java edition and fixed animation

And its the death animation pictures

Here the picture

Next 

We have mutant shulker it have 2 phases he is so agresive on phase 2 phase 1 health 70 and phase 2 are same the phase 2 damage its 30 per hit And he have a Death animation (and a little bug that can,t i fix it) 

And he have a death animation maybe soon i will be make the fly animation

If you kill him you Will get shulker boxes and if you kill the mutant you will be get achievement mutant hunted

Here the picture

Next 

We have mutant husk he have 150 health on phase 1 75 health on phase 2 damage 12-14 he is hard to killed but he wont spawning husk  a A little update he is no attack sounx bug because i was fix it and hurt sound

           Pictures

Next 

We have a item sword name wither claymore it Will be better by killed mutant wither skeleton damage 9 with strength 3 its so op

Next 

We have cactus bucket acctually ITS retextured milk so yeah the bucket ITS cactus tho here the picture and i add the new texture just see in your minecraft

Next 

We have mutant blaze he have 150 health and 1 attack if you hit it you will fly like in the Java and he will spawn rodling of he is rage If You kill it you will get mutant blaze core

         Picture

Note: 

This addon its just a boss monster in java but i make it on mcpe so support me so i can make more addon in the future