Blasphemy

Defy those who create life, for their life is equally false.
You curse, and will away the healing magics of nature and the gods. Each time a creature within a 60-foot radius of you would recover hit points from a spell, it must make a Charisma saving throw. If it fails, it does not recover hit points and instead takes 1d6 psychic damage. You can end this spell as an action.