Bloodlust Smite

The target hit by the attack roll from a weapon takes an extra 4d10 Necrotic damage from the attack. This Spell ignores resistance to necrotic damage. If a creature is bloodied or becomes bloodied by this attack, you have advantage to all attack rolls against the creature until it is no longer bloodied or you lose concentration.

Using a Higher-Level Spell Slot. The damage increases by 1d10 fir each spell slot level above 4.