Fire Durability
Whilst commonly referred to as "Resistance to Fire Manipulation", resisting the manipulation of fire isn't really how to explain this ability, and so the name "Fire Durability" or "Pyrodurability" seems to fit better. This ability is that of being fireproof, thus allowing you to tank attacks constructed of fire, as well as being able to plough through flames unharmed. A defence ability that cannot be subdued due to it being a passive one natural to the user.