MCLivingConversionEvent
This event is the parent event for MCLivingConversionPreEvent and MCLivingConversionPostEvent. It is only registered so that these two events work, you should never have to listen to this one directly.
The event is not cancelable.
The event does not have a result.
Importing the class
It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.
Extending MCLivingEvent
MCLivingConversionEvent extends MCLivingEvent. That means all methods available in MCLivingEvent are also available in MCLivingConversionEvent