Mirror Transport

Transmutation
Level: Artificer * 4, Sorcerer */Wizard * 4, Warlock * 4
Components: V, S, M (a glass or metal marble and a twisted loop of parchment)
Casting Time: 1 Standard Action
Range: touch
Target: one mirror
Duration: 1 hour/level (D)
Saving Throw: -
Spell Resistance: yes (object)
  This spell functions as mirror hideaway, except any creature that enters the target mirror can spend a Swift Action to exit through another mirror within 500 feet as if using dimension door; this is a one-way transport. The creature can exit through a mirror only if it could fit through an opening the same size as the mirror. Each transport through the target mirror reduces the spell's duration by 1 hour.