Thanks alot! I must give credit to Dungeon Dads 5e kurobozu statblock, fully lifted it from there:
Steal Breath.
A kurobozu can steal breath from a creature that is stunned, paralyzed, or asleep. The target must succeed on a DC 15 Constitution saving throw or suffer 1 level of exhaustion. Regardless of whether the target was successful on the saving throw, it can’t speak for 1 minute and its breath reeks of carrion. This also exposes the target to the kurobozu’s black apoxia disease.