Eldritch Strike

You have learned to use your Eldritch powers to assist you in melee combat as well.
You can imbue your weapon with the equivalent to your Eldritch blast cantrip.

• An imbuement of crackling energy spreads across your weapon. Make a melee attack against the target. On a hit, the target takes 1d10 force damage.
  The spell creates more spectral attacks when you reach higher levels: two strikes at 5th level, three strikes at 11th level, and four strikes at 17th level. You can direct the attacks at the same target or at different ones within range. Make a separate attack roll for each strike.