Brand of the Briar

Channel vitality into the soil or mud beneath the target, causing thick brambles to grow and ensnare the target if they fail a strength saving throw. If they pass, they instead take only 2d6 piercing damage. On a failed save these vines then break from the ground to form a tight vest of thorns around the target's chest region or closest approximation. As long as these vines are in place the target takes 1d6 piercing damage whenever they take a bonus action. If the target is hit with a melee attack, both the target and the attacker take an additional 1d4 piercing damage. This effect ends early if the target takes fire damage or receives the help action from another creature.