Passwall

Passwall
Transmutation [earth]
Level 5 (complex)
Casting Time 1 standard action
Components V, S, M (sesame seeds)
Range touch
Effect 5-ft.-by-8-ft. opening, 10 ft. deep plus 5 ft. deep per three additional levels
Duration 1 hour/level (D)
Saving Throw none
Spell Resistance no

You create a passage through wooden, plaster, or stone walls. The passage is 10 feet deep plus an additional 5 feet deep per three caster levels above 9th (15 feet at 12th, 20 feet at 15th, and a maximum of 25 feet deep at 18th level). If the wall’s thickness is more than the depth of the passage created, then a single passwall simply makes a niche or short tunnel. When passwall ends, creatures within the passage are ejected out the nearest exit. If someone dispels the passwall or you dismiss it, creatures in the passage are ejected out the far exit, if there is one, or out the sole exit if there is only one.

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