Thirsting Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon within this spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects as well as 2d6 necrotic damage. You regain a number of hit points equal to the necrotic damage inflicted by this spell. You do not regain hit points if the target is a construct or an undead.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the necrotic damage increases by 1d6 for each slot level above 2nd.