Chilling Smite (OES)

The next time you hit with a melee weapon attack during this spell's duration, your attack deals an extra 2d6 cold damage. Additionally, if the target is a creature, it must make a Constitution saving throw or have its movement speed halved for the spell's duration.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra damage increases by 1d6 for each slot level above 1st.