Black Flash

As you hold you summon your courage and strength, you clench your fist and throw a punch, a flash of black sparks outlined with a red light strikes the target. The creature this attack is aimed at must make a Dexterity saving throw. A creature takes 4d6 lighting damage on a failed save, or half as much damage on a successful one.

After hitting the creature this attack is aimed at the creature may not use magical attacks for a single turn and are stunned for a turn

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.