In the Anomaly World, anomalies are divided into five classes: Easy, Normal, Hard, Extreme, and Impossible. Each class has distinct characteristics and differences that are quite noticeable when compared to one another.
The first class, Easy Class, can be considered safe entities. They typically take the form of objects, though some may resemble humans. They will not attack anyone unless provoked. These anomalies usually reside in Peaceful Zones or Survival Zones. However, if they become angry, their destructive power can easily obliterate dozens of levels within the Level Space itself. Despite lacking unique traits, intelligence, or specific characteristics, their destructive capability should not be underestimated. In fact, anomalies of Hard or Extreme Class may not even possess the same level of destructive power as those in the Easy Class.
Next is the Normal Class. Entities in this class already possess distinct traits and can exhibit various characteristics. They are capable of attacking survivors if they choose to, but they generally lack high intelligence. As a result, they will only attack if a survivor or agent poses a threat to them. This class introduces what is known as Angary Mode, where an anomaly or entity, when angered, will attack survivors and anyone nearby. In this mode, their destructive power increases tenfold. However, it is rare to find Normal Class anomalies or entities in Angary Mode, except in more dangerous classes.
The Hard Class follows. Entities in this class can control their powers and often possess unique abilities, though these are still rare. Hard Class entities are akin to predators, hunting and killing their prey. They are usually in Alert Mode, always on guard, with heightened senses and significantly elevated stats. If they enter Angary Mode, their strength increases a hundredfold in every aspect. Handling them requires specialized attention from agents of Rank 4 to 6, who are tasked with either killing or capturing them. Additionally, these entities require secure containment and strict monitoring.
The Extreme Class is similar to the Hard Class but with notable differences. These entities possess intelligence, self-awareness, stable personalities, and the ability to control their actions, comparable to human psychopaths. They are guaranteed to have troublesome abilities and require extremely tight and specialized handling. Capturing them often mobilizes an entire division of Rank 6 agents, and they are housed in special containment units. Due to resource limitations in the Anomaly World, these entities are transported to the Real World through dimensional rifts. The Anomaly Foundation has the capability to connect the Anomaly World and the Real World without requiring a glitch.
Finally, there is the Impossible Class. Entities in this class are highly intelligent and can communicate with humans. They are incomparable to any other class, as they are nearly impossible to capture or study. Their intelligence and nature far surpass that of geniuses; they are super-geniuses. If they desired, they could enter the Real World, the domain of humanity, but they exhibit a unique trait—laziness—which prevents them from doing so. These entities are not confined to the Level Space; they exist beyond it, in a realm where the Level Space itself is an infinite stack of infinities. They do not attack unless they find it entertaining or enjoyable. If they wish to kill, they can do so effortlessly. In essence, they are the perfect counterpart to the Easy Class.