The ground in a 30-foot radius centered on a point of your choice within range sprouts numerous burr-covered shrubs. The area becomes difficult terrain for the duration. When a creature moves into or within the area it must succeed on a Dexterity saving throw, or burrs adhere to it.   Until the spell ends, you have advantage on Wisdom (Perception) checks to detect any creature with burrs adhered to it, and you are magically aware of its direction, but not distance, in relation to you.   A creature with burrs or another creature that can reach it can make an Intelligence (Investigation) ability check over the course of a minute against your spell save DC, finding and removing the burrs on a success.