Source: Unearthed Arcana 66 - Fighter, Rogue, and Wizard
3rd-level evocation
Casting Time:
1 action
Range:
Self (30-foot cone)
Components:
V
Duration:
Instantaneous
You unleash a destructive wave of mental power in a 30-foot cone. Each creature in the area must make a Dexterity saving throw. On a failed save, a target takes 5d8 force damage, is pushed 20 feet directly away from you, and is knocked prone. On a successful save, a target takes half as much damage and isn’t pushed or knocked prone.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.