From the description: Total Phagocytic Killer (TPK) is a Powered by the Apocalypse game about the immune system. Player Cells (PCs) are tasked with finding pathogens and stopping them from wreaking havoc in the host! The Germ Master (GM) plays as the environment, including both friendly (and not so friendly) cells. There are 5 different playbooks to choose from: - B Lymphocytes - T Lymphocytes - Natural Killer Cells - Macrophages - Neutrophils In addition to actions all cells can take, each type of immune cell possesses their own unique set of skills to get to the bottom of what is threatening the body you all call home