Chernobyll

Overgrown with radioactive growths and brimming with rage, Chernobyll is well known and feared throughout the Undye's depths.
Rarely emerging into the surface world, he's more oftenly found patrolling the depths or quarreling with other rotlords. He was once among the first settlers of the Undye, only to get too curious and become infected with the Deep Strain- transforming him into a monsterous beast with a craving for utter domination. His habits as a nocturne had been eliminated through the strain, surprising foes by not mimicking their battle style. Armor fused to his body, he is driven by a constant hunger that resulted from his helmet preventing him from eating. As rotlords are incapable of dying from hunger for as long as the intense radiation imbues them with energy from the outside, the hunger pains push him to deadly rages.
He is responsible for many deaths of both rotlords, seekers, and Understorians.
And as all mortal beings do, Sauron is the only beast he may fear as much as one fears death itself.