Rise of the Twilight Empire
Yeti are born from the fear of dying cold and starving. They are known as the Wendigo, and are born in the Feywild when mortals fear death by frost. They hunt down the living and eat their flesh, not for any sustenance, but because that is their nature. Fortunately, the same fears that spawn them cause them to be reclusive and stay close to their lairs. If you are attacked by Yeti, a fey crossing may not be far away.