Turn Wood

When this spell is cast, waves of force roll forth from the caster, moving in the direction he faces, and causing all wooden objects in the path of the spell to be pushed away from the caster to the limit of the area of effect. Wooden objects above three inches in diameter that are fixed firmly are not affected, but loose objects (movable mantles, siege towers, etc.) move back. Objects under three inches in diameter that are fixed splinter and break, and the pieces move with the wave of force. Thus, objects such as wooden shields, spears, wooden weapon shafts and hafts, and arrows and bolts are pushed back, those carrying them with them. If a spear is planted in order to prevent this forced movement, it splinters. Even magical items with wooden sections are turned, although an Anti-Magic Shell blocks the effects. A successful dispel magic spell ends the effect. Otherwise, the turn wood spell lasts for one round for each experience level of the caster.
The waves of force continue to sweep down the set path for the spell's duration, pushing back wooden objects in the area of effect at a rate of 40 feet per melee round. The length of the path is 20 feet per level of the caster, thus a 14th-level caster casts a turn wood spell with an area of effect 120 feet wide by 280 feet long, and the spell lasts for 14 rounds. Note that after casting the spell, the path is set and the caster can then do other things or go elsewhere without affecting the spell's power.

Sphere: Plant
(Alteration)
Level: 6

Range: 0
Components: V, S
Duration: 1 round/level
Casting Time: 9
Area of Effect: 120-foot-wide path, 20 feet long/level
Saving Throw: None