A Wendigo is an Otherkin cannibal which was originally a human. These came in the frontier ages, and it was legend that by eating human flesh you could gain great speed, invincibility, etc. Over time you would slowly turn into a ghoul like Wendigo.
The Wendigo has very few weaknesses. Guns and knives will do nothing. The main way to defeat it is by burning it. The Wendigo has a special way to keep its victims alive for a long time, while feeding on them. They however never lose their craving no matter how much they eat.