This spell allows you to scribe a potent rune of power upon or above a door or other opening measuring no more than 20 square feet/level in size. When the casting is completed, the symbol immediately triggers, glowing visibly and sealing the door or opening with an invisible barrier of force equivalent to a Wall of Force. Destroying the symbol ends the effect, though destroying it once the symbol has been activated requires destroying the Wall of Force first. Once triggered, the wall remains for 10 minutes per Caster Level.

When scribing a Symbol of Sealing, you can specify a password or phrase that allows a Creature speaking it to bypass the seal and pass through the opening. You can also attune any number of creatures to the Symbol of Sealing, but doing this extends the Casting Time.  Attuning one or two creatures takes negligible time, and attuning a small group (as many as 10 creatures) extends the Casting Time to 1 hour. Attuning a large group (as many as 25 creatures) takes 24 hours. Attuning larger groups takes an additional 24 hours per 25 creatures. Any Creature attuned to a symbol of sealing cannot trigger it and is immune to its effects, even if within its radius when it is triggered. You are automatically considered attuned to your own symbols of sealing, and thus always ignore the effects and cannot inadvertently trigger them. However, the force wall created by the symbol blocks attacks and line of effect even for creatures that know the password or are attuned—the password only prevents them from triggering the symbol, not from ignoring its effects if triggered.

A Disintegrate spell or similar effect can destroy the Wall of Force created by the symbol if the caster makes a Caster Level check against a DC of 11 + your Caster Level. A knock spell has no effect on a Symbol of Sealing or its force wall. A Symbol of Sealing cannot be dispelled, but Mage's Disjunction automatically destroys it.