As she continued to evade Meorise's attacks, Antoinette then activated her ability—which she dubbed, "Structure of Light"— to observe Meorise's Mana flow and realized that it was depleting at a very fast rate than normal.
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Structure of Light (Hikari no Kōzō) is an ocular ability which enables the user to view the Mana energy network within a living being appears as how the human circulatory system works but with a golden hue to represent the flow of Mana within the body; with faint light indicating depletion; bright light indicating full flow and no visible light indicating near death or complete death.
This ability is exclusive to and a special prize of the Vampire race, but only a few individuals are able to activate it completely and utilize it; in other words, only the members of the Draegorath Family and the Von Stein Household, to which the latter is a direct descendant of the former, which are now extinct.
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