Hallucinatory Terrain

Component Cost: 125 gp
Market Price: 680 gp
Key Skill: Arcana (no check)
Level: 8
Category: Deception
Time: 10 minutes
Duration: 24 hours

You lay an illusion over an area of natural terrain, no more than 20 squares by 20 squares in size, to make it look, sound, and smell as if it were a different type of natural terrain. Artificial structures, equipment, and creatures cannot be changed. A meadow might look like a hill, a pond could look like a meadow, and so on; but a road or a tower in the area remains the same.
    A creature can discern the illusion if it succeeds on an Arcana check or a Perception check (DC 10 + your Arcana check modifier). This check is a minor action if the creature has not interacted with the illusion, but can be made as a free action the first time the creature interacts with the illusion. If you conceal an area of hindering terrain, a creature is still entitled to a saving throw if forced into that terrain.

Published in Dragon Magazine 405.