The Idea of Evil lies deep in the Abyss, weaving its web of causality to float up to the surface of the Physical world. The Idea's influence is mostly indirect and accomplished through the use of agents such as the God Hand and the Apostles. While appointing Griffith as the fifth God Hand, it admitted manipulating events surrounding Griffith's ancestry and throughout his life to bring him to that point. He is (possibly) the true main antagonist of the series.
The Lost Chapter
God explains that it was born from humanity's need for a higher power. It explains that the sea of causality swirling them is also a part of it; God controls it. Also, and more importantly, it is filled with the emotions of mankind.
Griffith finally believes the god of the Berserk world. It states that it is responsible for everything that ever has been, is, or will be. It tells Griffith that his induction into the God Hand was decided long ago. The Idea combined the blood that would form his lineage and determined the times he would be born into.
It concludes by saying Griffith is the "Chosen One" and that he may have control over causality and the emotions of humans. It tells Griffith that he may do whatever he wants with humans: destroy or liberate them.
- The Idea of Evil claims that it was created from the negative emotions in human hearts rather than being a natural part of the world or a deity that has existed before the world's beginning. The being is essentially a God formed by the evils of humanity.
- As an extension of the above, it may be that since the Idea only exists because of the aforementioned emotions, it may be possible to purge it from from the Berserk world if humanity casts aside such emotions.
- The Idea of Evil is an evil version of Plato's Theory of Forms.
- The Idea of Evil is also based on the concept of God as the human subconscious like the God from Code Geass.
- Idea is similar to the evil spirit that lives within the Overlook Hotel: like him, in fact even Idea is the product of negative energies unleashed by humanity.