Blood Thorns

Bloody thorns wrap around a creature or object of your choice. These red thorns are unable to burn or be torn off by natural means. If a creature is targeted, it must make a Dexterity saving throw. A creature will take full damage on a failed save, or no damage on a failed one.

The thorns deal 6d6 piercing damage, and on the start of each turn, assuming the target has not escaped, they take another 3d6 damage. To escape, the target can make a Dexterity saving throw, and on a successful save they escape the thorns and they disappear. If the target fails its escape save, it automatically takes the 3d6 damage. A target that is stuck in the thorns is incapacitated. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the base damage increases by 1d6 for each slot level above 3rd.