Energies can be so chaotic that they manifest as pure fel magic, entropic horrors to lash out at all life - the essence they drop is poisonous.
In the RPG EditThis section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.
An entropic horror looks exactly like an entropic beast and is just as insane. Its true nature becomes evident only when it engages in combat, for the unnatural fire that burns within it drains the life from its opponents. Like entropic beasts, entropic horrors attack any living thing they encounter, ruthlessly and without remorse.