As an action, a creature that you can touch or see within 18 meters must make a Fortitude saving throw.
On a failed save, you temporarily afflict undeath as the creature takes 1d8 necrotic damage and it can’t regain health until the start of your next turn. If the creature is undead, it also has disadvantage on attack rolls against you until the end of your next turn.
At higher levels
This spell’s damage increases by 1d8 when you reach 9th level (2d8) and 17th level (3d8).