Here is a quick update to this script, that is compatible with v19 of Essentials.
This does not make use of the plugin in system, so you will need to copy the contents of each file into a new script section.
Why release this?
I'm already working on a complete version vor Essentials, however it will take much more time, due to all the changes. However the simulated battles where easy to do and therefore I don't want to hold them back.
Find the files
here.
Note: I just copied the files from my projects, but didn't test it any further. Let me know about any arising issues.