Evil, in a general context, is taken as the absence or complete opposite of that which is ascribed as being good. Often, evil is used to denote profound immorality. In certain religious contexts, evil has been described as a supernatural force. Definitions of evil vary, as does the analysis of its root motives and causes. However, elements that are commonly associated with evil involve unbalanced behavior involving expediency, selfishness, ignorance, or neglect.
The Evil in Berserk is a representation of the Idea of Evil in the Physical World. Evil is made of all negative thoughts in the human heart, even after their deaths evil still lives in the world. It can possess living or non-living bodies such as weak-willed humans, animals (horses, dogs) and even non-living organisms such as snow, stones, earth, wind, trees, etc. When it possesses living bodies, the body starts to deform and the being in question loses control. For example, evil-possessed humans start to eat their relatives, or other people.
In the Incarnation Ceremony, evil thoughts were so intense they physically materialized in a form of corrosive liquid mass. They corruped human bodies like an acid, absorbing them and growing in size. In this form, they cannot be attacked by weapons except fire, which burns and destroys them completely.
- Evil is named "Demon" by many people, in the Incarnation Ceremony.