Circle of Necromancy

You create a 10-foot radius circle centered on a point you can see within range. Creatures cannot regain hit points while in the circle's area. Undead in the circle's area have advantage on attack rolls and gain temporary hit points equal to your spellcasting ability modifier. A creature that is reduced to 0 hit points inside the circle die and rise as a zombie under your control 1 round later. When the spell ends, any zombies created by this spell die when the spell ends.