Eldritch Sting

You evoke a layer of crackling onto your weapon. Make a melee spell attack against one creature or object in range. On a hit, the target takes 1d10 Force damage plus your spellcasting ability modifier. 

Cantrip Upgrade. The spell allows you to channel the crackling energy into two attacks at level 5, three attacks at level 11, and four attacks at level 17. You can channel all the energy into one attack or multiple. Make a separate attack roll for each.