Burning Blood

You cause the open, bleeding wounds of one target you can see within range to burst into blood-red flame. The target must make a Constitution saving throw each round. The creature takes 3d8 fire damage on a failed saving throw, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.