Spike Stones

The spike stones spell causes rock to shape itself into long, sharp points which tend to blend into the background.

It is effective on both natural rock and worked stone. The spike stones serve to impede progress through an area or actually inflict damage.

If an area is carefully observed, each observer is 25% likely to notice the sharp points of rock. Otherwise, those entering the area of effect of the spell will suffer 1-4 points of damage from each spike stone that hits, success of such attacks determined as if the caster of the spell were actually engaging in combat. Those entering the area are subject to attack immediately upon setting foot in the area and upon each step taken therein afterward. The initial step will be sufficient to allow the individual to become aware of some problem only if the initial attack succeeds; otherwise movement will continue and the spike stones will remain unnoticed until damage occurs. 

Charging or running victims will suffer 2 attacks per 1" of movement rate over the area of effect after initial damage is taken before being able to halt.

Others will suffer but 1 additional attack-like check. 

Those falling into pits so affected by spike stones will suffer 6 such attack-like checks, each made at +2 probability "to hit" for each 10-ft of distance fallen, and +2 on damage inflicted per 10-ft distance fallen, spike damage being in addition to falling damage. 

The material component of this spell is four tiny stalactites.

This spell is the same as the 4th-level clerical spell of the same name.