Throat Rot

Choose one creature you can see within range. The target must succeed on a Constitution saving throw or its throat rots for the duration. While affected this way, a creature takes 2d8 necrotic damage whenever it first attempts to speak, plus another 2d8 necrotic damage for every 5 words spoken thereafter. If the creature casts a spell with a verbal component, it takes 1d8 necrotic damage for each level of the spell cast.