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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.

Chaos Beast (混沌獣) is a type of monster that appears in Mass for the Dead.


Chaos Beasts are endemic to the New World, appearing after the Great Tomb of Nazarick transferred from YGGDRASIL during the Catastrophe. They appear from purple fissures that erupt spontaneously throughout the regions and even in Nazarick.[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.

Types of Chaos Beasts[]


These creatures resemble creatures made of amethyst colored metal and crystal, which appear as Chaos Stones. In other rare cases, these stones are embedded in the center of their bodies.


Chaos Beast Icon

Chaos Beasts are noted to be more stronger than average monsters, and their appearances greatly vary from one another.[2] A few powerful types are mostly humanoid and wield weapons and other special abilities and seem to hold general sway over the lesser breeds. Chaos Beasts seemingly appear from the Cracks, which are also able to bypass the defenses of the Great Tomb of Nazarick, prompting the NPCs to be always on guard in case of an attack. In addition unlike other monsters, that fight on instinct or reason, Chaos Beasts will prioritize strong targets based on their level of power. On average most Chaos Beasts are above the difficulty rank of 50 based on the Adventurer's difficulty level for monsters.[3]

Based on Nazarick's experiments it's hypothesized that they possess some sort of sense to help them locate possible prey. Instant death spells can affect these creatures, though experiments have shown this to be the case for ordinary Chaos Beasts and not specialized ones.[4]

Upon defeat, a Chaos Beast's body will dissipate, leaving only a Chaos Stone.[5] According to Momonga, these Chaos Stones are very similar to an item drop like a Data Crystal from YGGDRASIL.[6]

Known Chaos Beasts[]


  • Usually, in the game, their appearances are heralded by cracks or ruptures in an area of space.
  • There is a new species of unnamed Chaos Beasts that looks similar to slimes, yet unlike a slimes are able to split themselves when attacked like a planarian.[7]
  • They seem similar to spawned monsters from YGGDRASIL though they are a type that Momonga has never seen in the game.
  • Due to the Chaos Beasts, the human nations are in a state of perpetual war, thus weapons and armor are in high demand causing ore prices to rise in the cities.[8]
  • Chaos Beasts were absent in the interior of the Azerlisia Mountains and the area where the Dwarf Kingdom was situated implicating that no Cracks had formed there yet.[9]



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