Shield

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Unobservable defensive barriers that are scattered throughout Sakura Labyrinth.
These walls protect the secrets held within the hearts of the girls who were placed in the Labyrinth.
As in the Secret Garden, if their secret is revealed they lose the will to protect it, and are destroyed.
Secrets that are too fondly thought of are also risky.

Fate/EXTRA Material: Encyclopedia of Fate/EXTRA