Monster Mountain

This creature can only be summoned on a blood moon. A servant of Monster Mountain must perform an ancient ritual of innocent blood shed along with reciting an evil incantation on this cursed land. Once the ritual is complete, the dirt becomes a spooky reptilian green before the head of the monster reveals itself and is allowed to feed on people til sunrise. The servant who feeds it til it is full is granted one wish. But if you can not feed it till it's full, you will be cursed to become a part of the Mountain, forever imprisoned within its rocky walls.