Black Flash

As the user says "Black Flash" they cause a distortion in space that occurs when raw magical energy is applied within 0.000001 seconds of a physical hit. When the user is able to achieve this, their magical energy flashes black, and the destructive power of their strike is equal to a normal hit to the power of 2.5 dealing 4d10 force damage. Upon a successful hit, the user can roll to beat a WIS saving throw of 14 in order to keep the spell up for their next attack.