Sword of Force

You conjure a weapon of ethereal energy that takes form in either your empty hand or from your arcane focus. As a bonus action you can make a melee spell attack at a creature within 30ft as the weapon lashes out towards them, on a hit you deal 3d8 + your spellcasting ability modifier force damage.  

When you cast this spell using a spell slot of 4th level or higher the damage increases by 1d8 for every 1 slot level above 3rd