Anomalies of Impurity

One of the nine cataclysmic events that make up The Great Calamity . There are 9 Anomalies that are essentially the essence of pure evil that was a by-product of the defeat of Hextor by the Triquetra.
Each of the anomalies was designed to corrupt and distract humankind away from the gods:

Pestilence - or the spread of disease and sickness to the magical beings of the land.