I realized that the plugin hasn't been updated in a long time so I took it upon myself to make some changes, like restoring messages for when NPCs kill each other or die by other means that the plugin ignores. 
How would I go about adding tunnel dwellers, underwater dwellers, sharks and mostly anything the plugin doesn't account for?

I'd be glad to share my modified versions (with and without NPC vs NPC) once I get this sorted out