Metody

From publisher blurb:

The demon realm of Malfeas lies wholly apart from the mortal world, subject to its baleful masters’ whims and never graced with the orderly presence of Creation’s elements. Instead, its cracks ooze with Theion To, or vitriol: the acid of Hell. The metody are vitriol spirits, alien cousins to Creation’s elementals. They can assume any sort of twisted or distorted human form, often horned or hooved; a few prefer disfigured animal shapes. They only take unblemished forms under compulsion. Their passage etches smoldering footprints into stone and trails a sulfurous stench.