You sling a beam of crackling, dark energy at a target within range. Make a ranged spell attack, on a hit dealing 1d12 necrotic damage and forming a link via the beam. The creature's movement speed becomes a maximum of 5 feet while affected by this spell, and unless the target has the hover tag, cannot fly. You may use your action on each of your turns to deal 1d12 necrotic damage to the target. The spell ends if you use your action for anything else or if the target moves out of the spell's range.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the initial necrotic damage increases by 1d12 for each slot level above 3rd.