The Six Holy Heavens do not actually exist.
It is the "realm" that a knight will inevitably see upon reaching level 9.
What is a "realm"?
Possessing different layers of power, being at different levels of status,
One can see the unique "environment" and "world" belonging to this layer.
The Six Holy Heavens are such a place.
Of course, this is the name Levi himself chose.
If another level 9 knight were the first to reach this realm,
They might choose a name with a different style.
According to Levi's categorization,
The Six Holy Heavens are:
Destruction Heaven, Vajra Heaven, Invisible Heaven, Undying Heaven, Indomitable Heaven, No Hidden Heaven!
These represent the level 9 realms of the six dimensions.
After stepping into the Six Holy Heavens, a knight has truly achieved metamorphosis.
This is not simply about becoming stronger.
It is an ascension in the level of life.
From human to demigod, from transcendent to legendary.
Therefore, Levi says,
