Sword of Justice

You cause a gleaming sword of radiant energy to fall from the sky. Choose a target on the ground within range, they must succeed on a Dexterity saving throw or take 3d6 radiant damage and be knocked prone. On a success the target takes half that damage and isn't knocked prone

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.