Due to its civilization of Water Darkness, Aku is considered to be the "Evil" God while Zen is the "Good" God with the Light Nature civilizations. After linking together they are referred to either the "Ultimate Transcendence" (or "Akuzen") and aim to stop the conflict between the Good and Evil forces.
While linked, they are the only God creature to consist of 4 civilizations.
Two "Saga" creatures were later released both with effects based around Aku and Zen.
Despite the fact that the DMC-57 and DM-26/DMX-14 versions of these cards have different illustrations, they are still linkable due to their card names despite the mismatched artwork. This trait is shared with the God Link of Geki and Metsu .
After the resurrection of Ballom in his new Ballom Emperor, Lord of Demons form, the returned gods banded together to fight off the forces of the Darkness Civilization army. These gods included Aku and Zen.
List of Aku and Zen cards
- Aku, Ultimate God
- God Bringer
- God Saga
- Saga, the Almighty Creator
- Zen, Transcendent God
- Violence Heaven