Syphon Strike

You brand your blade in necrotic magicks. As part of the action used to cast this spell, make an attack roll within range of the weapon. In addition to dealing the normal damage of your weapon, you deal an additional 3d6 necrotic damage. additionally, you restore 2d6 hit points. 

At Higher level: WHen you cast this spell using a spell slot of 2nd level or higher, the damage and healing increases by 1d6 for each slot.