Currently, this plug-in already uses damage sources and damage causes, but they are limited to the ones provided by Minecraft and Bukkit. It would be nice if users could add truly custom damage sources. I should implement the following:

• Users can define custom damage sources. Each custom damage source can have a list of entity resistances. (For instance, creepers might be weak to the damage source while skeletons resist it much better.)
• Custom armor can provide resistance to each custom damage source.

This has been implemented in KCI 12