Blade Burst

You create a ring of ethereal swords that encircle you, vanishing in particles like shattered glass.
Each creature within range, other than you, must make a Dexterity saving throw or take 3d6 force damage. 

On success, they take half the damage.

At higher levels: the spell's damage increases by 1d6 per spell slot above 1st, and range increases by 5 ft. for every spell two slots above 1st.