Electrified blade V2

You speak into a weapon that you are holding, and then cover the weapon in a spark or lightning. Your weapon is engulfed in electricity, small sparks emanating off of it. For up to 1 minute, when attacking with this weapon, you deal an extra 1d4 lightning damage, this damage increases to 1d6 at 5th level, 1d8 at 11th level, and 1d10 at 17th level.