Arcane Lock

Schools: Abjuration
Level: Sor/Wiz 2
Components: V, S, M
Casting Time: 1 action
Range: Touch
Target: The door, chest, or portal touched, up to 30 sq. ft./level in size
Duration: Permanent
Saving Throw: None
Spell Resistance: No

An arcane lock spell cast upon a door, chest, or portal magically locks it. The character can freely pass the character's own lock without affecting it; otherwise, a door or object secured with arcane lock can be opened only by breaking in or by a successful dispel magic or knock spell. Add +10 to the normal DC to break open a door or portal affected by this spell. Note that a knock spell does not remove an arcane lock. It only suppresses it for 10 minutes.