the objective is to extinguish a specific species. you do this through various diseases and to various animals. That also gives me the idea of infecting multiple animals at once (or using multiple diseases) and possibly making the end message "wiped out all life on earth" a reality(ofc not all rl animals have to be included). Your threats would be immunity or humans using medications and/or vaccines. I also have the idea of subspecies,ndemic can implement things like: immunity in a specific subspecies, certain evolutions needed to infect a subspecies.