Deadly Shadow Veil

The Shadowfell manifests around you, hiding you and bolstering your next attack. You become invisible until the spell ends. The spell ends if you make an attack or cast a spell. If the attack or spell that ends this one deals damage to a creature, you can deal 1d10 necrotic damage to one creature that attack or spell damages.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for every two slot levels above 2nd.