Perfect Insignia

Perfect Insignia
Psalm of the Grand Order, a Perfect Insignia.
Japanese	完全一式
Rōmaji	Kanzen Isshiki
Debut (Light Novel)	Volume X
Debut (manga)	ES Final Chapter
Appears in	Light Novels, Eternal Song

Perfect Insignia (完全一式, Kanzen Isshiki) is a general term for a special class of Unrestricted Spell Insignias. When even a portion of these Unrestricted Spell Insignias are carved onto something, they cannot be destroyed or interfered with by normal means. The only known Perfect Insignia is the Psalm of the Grand Order.

Plot

Perfect Insignia portions can be destroyed if the possessor of the original insignia resonates with the portion. Hecate of Bal Masqué's Trinity aimed to destroy Asiz's portion of the Psalm of the Grand Order during the final battle of the Great War, but had difficulty due to Asiz having two fragments which were interfering with each other, and because Dantalion had altered the original insignia. Later, Asiz's Perfect Insignia portions were easily destroyed by Alastor, who had manifested as the God of Retribution through Divine Summoning. The after-effect of the Psalm of the Grand Order's destruction caused Hecate great pain.

Though the Perfect Insignia can't be destroyed or interfered with, this is not the case for the object it is carved onto, as Bel-Peol feared that the Tyrant, which had many Psalm of the Grand Order insignias inserted into it, would be destroyed.

During the final battle of Misaki City, Shana loaded an altered Psalm of the Grand Order insignia into the Treasure Tool Chorde and tried to drive Chorde into the Psalm of the Grand Order cocoon enclosing Hecate while it was in the middle of creating the New World Xanadu, in order to alter the New World's laws, but she was blocked by the Tyrants, the cocoon's defensive mechanism. However, Shana was later able to drive Chorde into the cocoon using the Unrestricted Spell Shinku.