VDA VandalWarn may be installed with
VDA.load("VW");. With VDA VW, you can generate a customized message you can use to warn vandals and other rulebreakers.
VDA VW plants a "Warn this editor" button on diff pages with a difference of one revision. By clicking this button, you can fill out a basic form that allows you to warn the editor that made the change.
You can also choose to revert the vandal edit(s) with VDA RV and warn the editor in one click. This will only work if VDA RV is installed.