What is "AGE" (Scenario editing/modding context)?

So I’ve been working on a scenario, and looking through the editor there are some new functions that aren’t exactly intuitive. For example, the ability to set a unit as a “blood unit.” In the latest update that mentions these new options, it just says in parentheses next to these abilities “(see AGE)” without any further context, and no hyperlink is provided. And as you might have guessed a google search is not going to be very helpful here. So does anyone know what this AGE is, and where I can find it?


Advanced Genie Editor, but I can’t help with the download or anything.

Awesome, found it on Heavengames. Thanks!