Thorn Bind Hostage

Blue spectral thorns erupt from the ground, binding a creature within range. The target must succeed on a Dexterity saving throw or become Restrained. While restrained this way, the thorns remain anchored.

Each time a melee attack hits the target, one thorn is severed, and the target takes an additional 2d6 force damage (once per turn per attacker). Up to 5 thorns can be severed this way before the effect ends. The spell ends early if all five thorns are cut.

At Higher Levels: When cast using a spell slot of 3rd level or higher, add one additional thorn (and potential trigger) per level above 2nd.