Kieran could understand the whole structure of the Grand Demonic Heptagram now, but he realized after he understood it, it didn't provide much of a use.
Even though he could described in details how the Grand Demonic Heptagram turned a human into a half-dead or a half-spectre, granting them all sorts of peculiar powers, it didn't help him in any aspects because he didn't know the incantations nor the required casting ingredients.
Without the incantations, Kieran couldn't activate the magic circle and without the required casting ingredients, it was like human model missing a bone structure, displaying an empty vessel with only the looks.
The other giant magic circle that was branded in the whole city shared a similar fate as well.
No doubt his results were disappointing.