Bloodburn

Select one creature within range that has been wounded in the last minute and hasn't yet received any healing. If the creature fails a Constitution saving throw, the blood flowing from its wounds bursts into fire, inflicting 5d8 fire damage to the creature at the start of each of its turns and preventing it from receiving any healing while the spell is in effect. The creature can repeat the saving throw at the end of each its turns; the spell ends when it has made two successful saves, which need not be consecutive.