Baptism of Fire

This spell bathes a creature of your choice in purifying flames, paradoxically strengthening them despite their burns. Choose one creature you can see within range to bathe in fire. An unwilling creature must make a Dexterity saving throw to avoid the effect. A willing creature or unwilling creature that fails its Dexterity save takes 3d8 fire damage. Its hit point maximum increases by the amount of fire damage taken for the duration.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the fire damage increases by 1d8 for every slot level above 3rd.