This magical wall augmentation operates similarly to planar warding, but with the added feature of sending any would-be interloper to another place entirely. When designed, the shift snare for the stronghold space is given a destination point within ten miles. The target may make a Will save against DC 24 to escape the snare; those who succeed are simply affected as if by planar warding. Those who fail the saving throw are whisked to the predetermined location, appearing there instantaneously (and probably with some surprise).

Caster Level: 17th; Prerequisite: Craft Wondrous Item, seal portal (MotP), zone of respite
(MotP), gate; Market Price: 45,000 gp per stronghold space or freestanding wall.

Adapted from the Planescape Campaign Setting on Planewalker.com