A brilliant silvery gateway beckons the unwary.
Wondrous Item 2,125,000 gp
This hallway is lined with enchanted mithral. It is 10 squares long and 6 squares wide and high. You can spend 1 hour to attune yourself and up to eight other creatures to the hallway. The hallway makes an attack as an opportunity action against any creature that enters any square in the hallway: +32 vs. Will; target is immobilized (save ends).
Power (Teleportation) Daily (Standard Action)
Make an attack against an immobilized creature in the hallway: Ranged 10; Intelligence or Charisma + 5 vs. Will; the target is trapped in an extradimensional maze (save ends). While trapped, the target's turns start and end as normal, but it can't take actions and it has neither line of sight nor line of effect to anything, and nothing has line of sight or line of effect to it.
Published in Dragon Magazine 383, page(s) 47.