This spell allows the caster to magically seal a door, window, box, or similar closure against a broad class of creature (lycanthropes, undead, faeries, giants, and so on). Affected creatures cannot pass the seal, nor are their physical or magical abilities, immunities, or resistances effective against it or the material of the closure. A creature of the affected type whose level or Hit Dice exceeds the casters by four or more can shatter the seal.
Nonaffected creatures can eliminate the seal by physically destroying the door, box lid, and so on. The warding magic inflicts one-quarter damage (round down) caused to the closure back upon the creature trying to break through. A successful dispel magic spell removes the seal.
The seal lasts until the portal is opened, unless made permanent by the permanency spell.
Notes: Very rare spell. (Updated from Dragon Magazine.)