Attacks by the creatures, happens when you leave a scent trail behind. They become more and more common the more times the border drops below 15.
Rock infestation, happens when a cat comes into contact with specific rocks in the territory. Rocks slowly take over the cats body and when they are fully taken over they are controlled by the rock they stepped on. If any cat not infested gets a bit of the infested cats rock parts in them they to will become infested.
Voices or whisper take over, happens when a cat gets the voices or whispers and ends up getting taken over by what they say to them. The best thing to do when this happens is isolate the cat that has the voices of whispers until they are better.
That's all of them for now. You can suggest more if you want to.