Bloodmark

You mark one creature you can see within range with a pulse of sanguine magic. Until the spell ends, you know the direction of the target while it is within 1 mile of you, and the first time each turn that you damage the target with a spell, it takes an extra 1d4 Necrotic damage.

If the target is a Fiend, Undead, Aberration, Monstrosity, or shapechanger, the extra damage becomes 1d6.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra damage increases by one die for every two slot levels above 1st.