Triplash

You conjure a tendril of arcane energy to impede the creature's movement. You choose the shape and form this tendril takes. The creature must make a Dexterity saving throw. It takes 2d6 bludgeoning damage and is knocked prone, or half as much damage and is not knocked prone on a success.

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