It’s basically a parasite for someone’s soul taking control of certain actions. It also affects physical and mental traits such as intelligence or strength. Disguising it’s self it’s hard for it is an entity that only the host can see. This parasite was the reason why so many people went to mental asylums and of shore “care places”. When reaserchers found out about it they called it a puppet due to looking like a worn out puppet. After this was found though the parasite grew more aggressive and more voilent giveing orders to The host that they normally wouldn’t do. The Reasearch was destroyed in a massive fire never remade cause the cost of that research would cost hundreds of thousands of the taxpayers money.