Spike growth

Range: 150 feet
Material: seven thorns
Duration: Concentration up to 10 minutes
The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.
The transformation of the ground is camouflaged to look natural. Refer to PHB