Level: Sorcerer 6, Wizard 6
Components: V, S, M$
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Target: One door, chest, or other opening or open space up to 30 sq. ft./level
Duration: Permanent
Saving Throw: Reflex half; see text
Spell Resistance: No
While pointing at the target, you trace the lines of a complicated sigil that visually appears where it is to seal. The sigil glows with latent magical energy.
This spell functions like sign of sealing, except that it can also be used to seal an open space (such as a corridor or an archway), creating a magical barrier of force that repels any creature attempting to pass. In addition, doors and objects protected by a greater sign of sealing are strengthened, increasing their hardness by 10 and granting them an extra 5 hit points per caster level. Any object protected by a greater sign of sealing is treated as a magic item for the purpose of making saving throws and gains a +4 resistance bonus on saving throws. If its seal is broken, a greater sign of sealing deals 1d6 points of damage per caster level (maximum 20d6) in a 40-foot radius (Reflex half).
A greater sign of sealing cannot be passed with a knock spell, but it can be dispelled (DC 15 + the caster level of the sign’s creator). It can be disarmed with a DC 31 Disable Device check.
Material Component: A crushed emerald worth at least 500 gp.
Source: Spell Compendium, page 190. Previously published in Complete Arcane, page 122.