Passwall

A gap opens in the impenetrable Caldanis Fortress Wall, peeling the solid stone into a passageway as if it were a pair of tent flaps. “Come,” says your guide, “we have only a short time before they notice this trick . . . or it closes on us.”

Component Cost: 1,000 gp
Market Price: 2,600 gp
Key Skill: Arcana
Level: 12
Category: Exploration
Time: 10 minutes
Duration: 1 minute

You create a passage through any solid material. You choose the orientation of the passage relative to the surface you touch. The passage is 1 square wide and tall. The passage can be a number of squares deep equal to your Arcana check result divided by 5. This ritual does not conceal the passage from anyone or bar anyone from entering. A creature inside the passage when it closes takes 5d10 damage and is ejected to the nearest end of the passage. This ritual does not affect the structural integrity of a cavern or a wall; the passage is a twist in space, not an actual shifting of material.

Published in Player's Handbook, page(s) 310.