Burning Shadow

You touch the shadow of an enemy, or the enemy itself, and watch it's shadow turn to roaring fire.
The creature makes a Dexterity saving throw. On a failed save it takes 3d6 fire or necrotic damage.
On a successful save it takes half damage.
Until the end of the caster's next turn, all attack rolls against the target gain advantage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.