Tier Five.
Normally, in this Flame Realm, when a Mage breaks through from Tier Four to Tier Five, they will condense an existence called "Magic Turbine" at the position of their Dantian.
Once the turbine forms, the "Whole Power" that was already condensed after breaking through to Tier Four will see a further leap in output efficiency during actual combat.
If this leap were to be quantified, it would be roughly three to five times.
In other words, once the "Magic Turbine" condenses, the amount of Magic Power a Mage can output in a unit of time will directly increase by three to five times! On this basis, further progressing to Tier Six, condensing the "Lifebound Magic Staff", with the "Turbine" complemented by the "Staff," a Mage's entire "Combat Power Training Stage" from Tier Four to Tier Six is considered complete.
This is the usual scenario.
It applies to the Earth Fire Mage in this world, as well as the Warm Fire Mage.
