Vloriak, also called Despoiler or Rust Demons, are fiends that inhabit the Ironlands. They are insectile in appearance, suspiciously similar to humanoid rust monsters, and just like those animals, the vloriak's touch degrades metal.
Unlike rust monsters, however, vloriak's don't need to eat rusted metal to survive. Instead, they thrive on the destruction of artifice and crafted goods, they want to see the hard work turn to rust.