Ashardalon's Blurring Blows

Draconic flames form along your arms and legs, slightly transparent. This increases your striking power and speed to so fast that your actions blur. 

As an action you can deal a melee attack with incredible speed and strength. As you swing your arm or leg for a strike, your motion blurs, showing the true speed of this spell. You roll a Melee spell attack, on a hit the target takes 2d12 Bludgeoning and 1d12 Fire damage. Any creature in a 30ft cube must succeed a WIS save or take 3d12 Thunder damage. Half on a pass. The target must succeed a CON save or be deafened.  

At Higher Levels. For each level above 4th, this spells damage increases by 1d12 Fire, for ever 2 levels above 4th the damage increases by 1d12 bludgeoning