Blood Drain

Choose one creature within range, that creature has to succeed on a constitution saving throw against your spell save DC. On a failed save, the creature takes 1d6 necrotic damage and you gain a number of temporary hit points equal to your proficiency bonus.

Cantrip Upgrade. The damage increases by 1d6 when you reach levels 5 (2d6), 11 (3d6), and 17 (4d6).