Umbral Grenade

A small, black orb appears at a target location you choose within 120 feet. Every creature within 30 feet of the orb must make a Constitution saving throw, as the orb leeches life-force energies from them, causing the orb to swell and fester, before exploding in a blast of necrotic energy, dealing 5d12 Necrotic damage on a failed save, or half on a successful save.