Spike Growth

School: transmutation; Casting Time: 1 standard action; Components: V, S, DF.
Range: medium (100 ft. + 10 ft./level); Area: one 20-ft. square/level; Duration: 1 hour/level (D).

Any ground-covering vegetation in the spell’s area becomes sharply pointed without changing its appearance. Any creature moving on foot into or through the spell’s area takes 1d4 points of piercing damage for each 5 feet of movement through the spiked area. Any creature that takes damage from this spell must also succeed o