Hallucinatory Terrain

By means of this spell, the wizard causes an illusion that hides the actual terrain within the area of effect. Thus open fields or a road can be made to look like a swamp, hill, crevasse, or some other difficult or impassable terrain. A pond can be made to look like a grassy meadow, a precipice look like a gentle slope, or a rock-strewn gully made to look like a wide and smooth road. The hallucinatory terrain persists until a dispel magic spell is cast upon the area or until the duration expires. Individual creatures may see through the illusion, but the illusion persists, affecting others who observe the scene.

If the illusion involves only a subtle change, such as causing an open wood to appear thick and dark, or increasing the slope of a hill, the effect may be unnoticed even by those in the midst of it. If the change is extreme, a grassy plain covering a seething field of volcanic mudpots, for instance, the illusion will no doubt be noticed the instant one person falls prey to it. Each level of experience expands the dimensions of the area affected. e.g., a 12th-level caster affects a 120 yd. x 120 yd. x 120 yd. area.

[Player's Handbook]

School: Illusion/Phantasm
Level: 4
Rarity: Common

Range: 20 yards/level
Components: V, S, M
Duration: 1 hour/level
Casting Time: 1 turn
Area of Effect: Cube up to 30' (10 yards) per side/level
Saving Throw: None

Material Components: a stone, a twig, and a bit of green plant - leaf or grass blade (consumed)