Arcane Lock

Player's Handbook v.3.5 (PH)Core (3.5)
School
Abjuration
Casting Time
1 standard action
Components
V, S, M
Range
Touch
Target
One door, chest, or portal up to 30 sq. ft./caster level
Duration
Permanent
Saving Throw
None
Spell Resistance
No

An arcane lock spell cast upon a door, chest, or portal magically locks it. You can freely pass your own arcane lock without affecting it; otherwise, a door or object secured with this spell can be opened only by breaking in or with a successful dispel magic or knock spell. Add 10 to the normal DC to break open a door or portal affected by this spell. (A knock spell does not remove an arcane lock; it only suppresses the effect for 10 minutes).

Material Component: Gold dust worth 25 gp.