Vampiric Aura

8th-level Necromancy
Casting Time: 1 action
Range: Self (30-foot radius)
Components: VSM (a vampyr fang)
Duration: (C) 10 minutes

Energies of voracious hunger wash out from in and around you, invigorating you and your allies within 30 feet with ceaseless hunger. Until the spell ends, the aura moves with you, centered on you. Whenever you or an ally in the aura’s radius deals damage with a melee attack, you or the ally regain hit points equal to half the damage dealt.

Source: Homebrew