The Aggronator is a scripting asset that allows you to create an 'Aggro' system for your game: from small groups of hostiles to armies, this fully customizable asset allows you to build a behavior system for your AI, which will analyze the number of hostiles and the number of allies (and also any other parameters you want to add) to decide an action to be taken.
The asset comes with an example scene with enemies that will choose between attacking hostiles, running from them or regrouping, and a document which explains how the scripts work and how to make changes to them to use in your own game. You can change the actions and the parameters to make it work in tune with your project, being it an RTS, an RPG, an action game, or any other genre.