Dheryth's Sanctum Sanctorum
(Abjuration)

Range:  10 yards
Components:  V, S, M
Duration:  Permanent
Casting Time:  1 hour
Area of Effect:  Twenty-seven thousand cubic feet
Saving Throw:  None

This spell seals off an interior area (eg. building, room, cave) with a volume up to 27,000 cubic feet, from entry by teleportation (including teleport, teleport without error, dimension door, and even Drawmij's instant summons and succour), plane shifting (including colour pools, border ethereal penetration, and plane shift), and similar magical effects.
Any of these teleport-like effects may be performed, however, if a password is known and spoken during the attempted entrance. There can only be one password at a time, but it may be changed by recasting sanctum sanctorum. The material component for this spell is a platinum lock, inlaid with gems, worth at least 10,000 gp.

