Breath of Death

You breathe forth a dark mist that clings to your foes and drains the life from them, invigorating you in turn. The target makes a Constitution Saving Throw, taking half damage on a successful save, and full damage on a failed one. As an action, you can call forth a black smoke which grips onto one creature, dealing 2d10 necrotic damage, you are then healed for half the damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.