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GA.png Non-Canon: REMINDER! This page is considered as among one of the many pure game contents found exclusive in Mass for the Dead only. It includes the new standalone characters that had a first-time appearance in the game. Meanwhile, the old characters had a different role and fate than from the main storyline in the official books. For that reason, it has no connections to the canon story materials of Overlord Light Novel series. The content that you had read here are based on the Overlord mobile game.

Contaminated Beast (汚染獣) is a type of monster that appears in Mass for the Dead.


Contaminated Beasts are monsters and animals that were mutated by the miasma of the Cracks from the Catastrophe.[1] These monsters serve as some of the major antagonists in the ruined New World as the three surviving nations: Re-Estize Kingdom, Baharuth Empire, and Slane Theocracy struggle to rebuild.


Contaminated Beasts are infected by the Catastrophe that affected the world. They come in a multitude of forms, weaker variants are mostly contaminated living creatures that range from humanoid goblins, quadrupedal wolves, lumbering trolls, etc. But a common trait is that they possess glowing red eyes.


Contaminated Beasts are stronger and more aggressive than baseline counterparts though are akin to berserkers with high levels of endurance. Additionally, they show no signs of fear, even against superior foes, and will continue to attack, risking death.[2][3] Even with skills of a Beast Tamer, Contaminated Beasts are untamable creatures and cannot be intimidated.[4]

It is theorized that the reason why these monsters attack indiscriminately is because their brain is severely affected by the miasma and thus it is not possible to make normal judgments. It is probable that the contaminated brain helps to remove the limiter for the body thus allowing the Contaminated Beast to move beyond its limit. To support this, from a dissection of a Contaminated Beast, it's learned that they undergo abnormal muscle development and damage. Strangely the damaged parts of Contaminated Beasts show signs of healing and physical strengthening giving them a muscle repair ability that allows them to heal at a speed that exceeds the damage they take.[5]

An even more troubling discovery on the nature of Contaminated Beasts, discovered by Sophie Noia, is that once a creature has been contaminated, even death does not release it from its affliction. Experiments delving into resurrecting a subject has revealed that the subject was not restored to normal but remained a Contaminated Beast. This would indicate that the change Contaminated Beasts undergo is not simply just a poison but also changes their race.[6]


  • Usually, in the game, their appearances are heralded by cracks or ruptures in an area of space alongside Chaos Beasts.
  • Some monsters, like slimes, undead, constructs have been shown to be immune to the effects of the contaminated gas. So far no cure has been found to rid the effects of contamination, though the Re-Estize Kingdom and the Great Tomb of Nazarick are currently developing a cure.[7][8]