Spike Growth

Duration: 10 minutes, Concentration
The ground in a 20 ft radius twists and sprouts
hard spikes and thorns. The area becomes
difficult terrain. When a creature moves into or
within the area, it takes 2d4 piercing damage for
every 5 ft it travels.
The transformation of the ground is camouflaged
to look natural. A creature that can't see the area
at the time the spell is cast makes a Perception
check against your spell save DC to recognize the
terrain as hazardous before entering it