So basically in the story these humans have animal companions that are pretty much linked to them. If the animal feels pain, they feel pain and so on. And well if the animal dies, oddly the human lives but are pretty much lifeless. Now if the human dies so does the animal. Now what I was thinking was we can have characters with animal companions and that the story is that humans who lost their companions become insane and that some have found a way to create mutants that resembled their companions. But that these mutants went insane and put the world into chaos. We can have our characters struggling to survive and find this kill code for these mutants because they have microchips that are connected to a computer that can control them.