Turn Wood

When this spell is cast, waves of force roll forth from the druid, moving in the direction he or she faces, and causing all wooden objects in the path of the spell to be pushed away from the druid to the limit of the area of effect. 

Wooden objects above three inches diameter which are fixed firmly will not be affected, but loose objects (movable mantlets, siege towers, etc.) will move back. Objects under 3 inches diameter which are fixed will splinter and break and the pieces will move with the wave of force. Thus, objects such as wooden shields, spears, wooden weapon shafts and hafts, and arrows and bolts will be pushed back, dragging those carrying them with them; and if a spear is planted in order to prevent this forced movement, it will splinter. 

The turn wood spell lasts for 4 rounds per level of experience of the druid casting it, and the waves of force will continue to sweep down the set path for this period.

The wooden objects in the area of effect are pushed back at a rate of 4" per melee round. The length of the path is 2" per level of the druid, i.e. a 14th level druid casts a turn wood spell with an area of effect 12"' wide by 28" long, and the spell would last for 56 rounds (5.6 turns). 

As usual, the above assumes the druid is using greater mistletoe when casting the spell.

Note that after casting the spell the path is set, and the druid may then do other things or go elsewhere without affecting the spell's power.

Even magical weapons with wooden sections will be turned. An anti-magic shell will protect from this spell, and a dispel magic will have normal chances of wiping out its effects.