Vampiric Weapon

You imbue a weapon you touch with vampiric power. For the duration, the weapon deals an extra 1d4 Necrotic damage when it hits, and you regain Hit Points equal to the amount of Necrotic damage dealt.

Using a Higher-Level Spell Slot. The Necrotic damage increases to 2d4 with a level 3–5 spell slot. The Necrotic damage increases to 3d4 with a level 6+ spell slot.