Conviction Of Blood

You touch a creature you can reach or yourself. If you target yourself, the spell is cast as a bonus action. An unwilling creature can make a Dexterity saving throw to avoid being touched by you. The targeted creature takes 6d8 necrotic damage. If the creature's hit points were not dropped to 0 by this damage, it then starts to regain 10 hit points at the start of each of its turns, until it has regained hit points equal to twice the amount of damage they took. 

At Higher Levels: The damage inflicted by this spell increases by 1d8 for each level above 3.