Also, unless the monsters are creatures that are more likely to serve as allies than enemies, I would prefer you left their actual statistics to me. I want encounters with monsters to include the occasional surprise. Do feel free to describe their backgrounds and descriptions however, including what their rumored abilities might be.
I have an idea for a habitat for your "anifiends," however.
The Blight Barrows
Nestled deep within the Moorlands is a haunted set of barrows housing the remains of a civilization long past. It is said that these consorted with foul creatures from dark planes and that even in death there lingers a faint trace of their tainted essence. The things that dwell in this place are not natural. They are cruel mockeries of their counterparts in the natural world, with bitter barbs and pointed protrusions issuing from their bodies in bizarre places. They are also violent and merciless to intruders.
Most travelers would just as soon avoid the Blight Barrows, however their existence has piqued the curiosity of scholars and explorers for ages past for a number of a reasons. First, the nature of the society that constructed them is a mystery, for there is no record, written or spoken, of a people who inhabited the land before the barrows were discovered. Second, the immediate vicinity around the barrows is the only known place in the world to harvest Blight, a fungus with incredible alchemical and magical applications. It is a common misconception that Blight is useful only to destroy living things or pervert nature. Used properly, it can actually be a curative agent as well. Attempts to cultivate Blight outside the Blight Barrows have been universally unsuccessful so far, much to the dismay of scientific minds everywhere. It is unknown whether there is some magical property of the barrows themselves that helps the Blight to grow or if it is some local element the Blight requires.