Chains of Levistus

Make a ranged spell attack against a target within range. On a hit, the target takes 3d6 cold damage, and spectral chains of ice leap from your hands and lash around it, pulsing with cold whenever it moves. If the target willingly moves before the start of your next turn, it immediately takes an additional 2d6 cold damage, and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the initial cold damage and the additional cold damage the target takes for moving both increases by 1d6 for each slot level above 1st.

-From Ravenloft Players Compendium page: 185