Arcane Seal

You touch an object, such as a scroll case, letter, or book and it becomes sealed for the duration. You and up to two other creatures you designate when you cast this spell can open the object normally. You can also set a sigil that, when traced upon the surface of the object, suppresses this spell for 1 minute. Otherwise, it is impassable until it is broken or the spell is dispelled or suppressed. Casting knock on the object suppresses the Arcane Seal for 5 minutes.

While affected by this spell, the object is more difficult to break or force open; the DC to break it or pick any locks on it increases by 10.