Yanfly Engine Plugins is a plugin library made for RPG Maker MV, a wonderful piece of software to help you make that role playing game of your dreams. You can find out more about RPG Maker MV here.
You can grab the plugin here:
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When selecting targets, RPG Maker MV has it set by default that the list of valid targets is always either alive enemies, alive allies, or only dead allies. Actions would not be able to target either actors or enemies or change from single target to multiple targets. This extension plugin for the Target Core will allow you to break free of that restriction for better selection control of targets as well as insert customized conditions.