Power of the Death Kiss

You have developed traits similar to those possessed by a death kiss, granting you the following benefits:

Ability Score Improvement. Increase your Strength or Constitution by 1, to a maximum of 20.

Lightning Resistance. You gain resistance to lightning damage.

Lightning Blood. When a creature within 5 feet of you deals piercing or slashing damage to you, the creature takes 1d6 lightning damage.

Blood Drain. As an action, you can force a creature grappled by you to make a Constitution saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the creature takes 2d10 lighting damage, and you regain half as many hit points. This damage increase by 1d10 when you reach 11th level (3d10) and 17th level (4d10).