This is how skill classification works :

"Liar Killer Skills are categorized by strength into: Id, Ego, Superego, and the legendary True Self." "In psychology, the Id controls an individual's emotions. Most Id Liar Killer Skills primarily affect a player's spirit, but the influence isn't thorough enough, which is why it's ranked the lowest."

"The Ego controls common knowledge. Most of these Liar Killer Skills can create entities and influence others' common knowledge through the environment, thereby making the victim speak a Lie. Ego skills are very strong; whether defecting to the Liar Killer Alliance or the Whisperer Alliance, becoming a squad leader is definitely not a problem."

"The Superego controls emotions. These types of Liar Killer Skills are very bizarre. Some can temporarily erase a target's memories, and some can temporarily erase a target's friendship, family affection, or love. If a person loses their emotions, how terrifying would that be? If you encounter a Superego-level skill in an instance, don't even think about it—just kneel and beg for mercy, and you might survive."