Valorium’s Vampiric Weapon

You touch a melee weapon, and for the duration, that weapon deals an extra 1d4 necrotic damage when it hits, and the creature holding the weapon regains hit points equal the amount of necrotic damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 5th or 6th level, the necrotic damage increases to 2d4. When you use a spell slot of 7th level or higher, the necrotic damage increases to 3d4.