Spike Growth

V, S, M; Concentrtion - 10 Minutes
The ground in a 20-foot radius within 150ft
twists. The area becomes difficult terrain. 2d4
piercing damage for every 5 feet travel.
Any creature that can't see the area at the time
the spell is cast must make a WIS (Perception)
check to recognize the terrain as hazardous
before entering it.