Wendigo

A mysterious being, which Ruby is desperate to find. There is currently two known photographs of a Wendigo, and it is unknown whether or not Wendigos truly exist. Ruby assures that they do, but nobody is yet certain. It's abilities are unknown, but it causes Ruby immense stomach pain, Ruby going as far as to describe it like so: "it felt like [her stomach] was being ripped apart; like someone was trying to rip it out of [her] body," as well as supposedly having the ability to speak to specific people, as exemplified in Chapter 4.