Draining Kiss

You drain the life from those you kiss. The target must make a Constitution saving throw contested against your spell save DC, taking 1d10 Psychic damage on a failed save, and it can't regain hit points until the start of your next turn. You gain a number of temporary hit points equal to half of the damage dealt rounded down. The target is unable to heal until your next turn.

If you kiss an undead target, the spell has no effect. If the target is charmed by you (taking damage allows them to reroll their charmed save) or willing it automatically fails the saving throw.

The damage of draining kiss increases by 1d10 when you reach 5th (2d10), 9th (3d10), 13th (4d10), and 17th (5d10) level.