For Plugin Support, please use the support site (vk2gpz.freshdesk.com).  You can also use 

NEWS! : MergedMob will make the spawn reasons persistent.  Your mob will maintain its spawn reasons even after the server reboot!!!
NEWS! : MergedMob now maintains/recovers removed McMMO metadata upon server reset!
NEWS! : You can now control noAI feature for each mob type!
NEWS! : It now supports Mythicmobs.

Since there is not any mob merge plugin which does what I wanted, I made this...

This plugin allows nearby living entities to be merged into one entity.  By doing this merging, you can significantly reduce the number of living entities (mobs) on your server -> reduce lags.





Some claimed that you can dupe an item by letting the merged mob to pickup an item you wish to dupe.  The below video tried to re-produce this claim but we could not do such.  Mobs (Husk) were spawned using
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/summon husk ~ ~ ~ {CanPickUpLoot:1b,HandItems:[{id:"stone",Count:1b}],HandDropChances:[0f,0f]}





  Screenshots

Commands:
  • /mergedmob | /mergedmob help : displays the help menu
  • /mergedmob reload : reloads the configuration file.
  • /mergedmob killall [radius:xxx] [type:XXXX]: kills all merged mobs

Permission Node:
  • mergedmob.reload: allows you to reload the config file.
Installation:
You just install MergedMob.jar into "plugins" folder.

Configuration:

  config.yml