The Fiura is an ugly forest hag on Chiloe Island.
Peter Venkman, Ray Stantz, Winston Zeddemore, Special Agent Melanie Ortiz, and an Egon Spengler from another dimension searched Chiloe for a key to Bishop Gottskalk Nikulausson's secret tomb. They followed a P.K.E. reading coming from inside a cave. A Fiura hid behind Melanie and watched them enter.
Based on Myth
According to Chilote myth, the Fiura is an ugly, squat woman with halitosis. She lives in the woods and is clothed in moss. She seduces young men. Once satisfied, she drains the victim of his energy - killing him in the process.