Deadlock

What they are
Deadlocks are special seals that block any damage or notice to or from living beings of the world of mankind.

Usually set up during battles, they may be used on the Being with Arcana using them or the place that is being used as the battlefield.

Who uses them
Normally, only a Being with Arcana would use a Deadlock. They use it to cover themselves from human notice, or repair damage that would draw unwanted attention.

Shiro; the Snow - Haired Icy - Eyed Specialist has a weapon so strong that his Deadlocks are unable to cover from notice.