Upon an individual using a considerable amount of oxygen which is needed for generating flames, they cannot use their Ignition Abilities until they've regathered the oxygen to do so. When one has overexerted their Ignition Ability, it can potentially lead to burning their own bodies and severe dehydration.
When a Third Generation overuses their ability, their bodies begin to char due to the lack of oxygen in the body. This is a type of disease called Tephrosis (灰病, Haibyō), and in some cases, it prevents the Third Generation from using their ability without feeling a great amount of pain.
List of Known People with Tephrosis Edit