You weave together threads of necrotic energy to creature a solidified slightly curved blade. The magic blade lasts until the spell ends, you put it away or are disarmed. It counts as a magical simple melee weapon that you are proficient with. To attack you make a melee spell attack. It deals 2d6 necrotic damage on a hit and has the light property. In addition, when you deal damage with the blade you can heal yourself or a creature within 10 feet of you a number of hit points equal to half the damage dealt.