Bloodrush

You follow up an attack with a burst of flame. After a beast, giant, or humanoid you can see within range hits a single target with a melee attack, the target takes 1d12 fire damage. If the target is a structure, it takes double damage. At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the target takes an additional 1d12 fire damage for each level above 1st.