Level: Sorcerer 8, Wizard 8
Components: V, S, M
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One 5-ft.-by-5-ft. opening, 1 ft./level deep
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
You toss the bit of earth against the wall and it glitters and burns as it strikes the stone. The rock vaporizes where it hits and a passage opens before you, burrowing into the wall.
As with passwall, this spell allows you to create a passage through wooden, plaster, or stone walls, but not through metal or harder materials. If a wall’s thickness is more than 1 foot per caster level, then a single excavate spell simply makes a niche or short tunnel with the stated dimensions. Several excavate spells can be used in succession to breach very thick walls by forming a continuing passage. Unlike passwall, excavate is an instantaneous effect that does not end and cannot be dispelled; any passage it creates is permanent.
Material Component: A pinch of excavated earth.
Source: Spell Compendium, page 85.