Marionettes are humans or animals or things that serve under an Astra, a God or an Elder. This happens through a contract of mutualism, where one serves the other, in exchange for an everlasting life, or immortality. When one doesn't follow the covenant, their souls are forever damned in the Underworld.
Marionettism is a term used to define the contract signing among two creatures. In this process, it is divided into three stages.