Originally, with the Nine Yang Strange Fire in his possession, almost no flame could hurt Chu Feng.
However, the tribulation fire was different. It arose from the depths of Chu Feng's divine soul, containing a trace of Heavenly Dao tribulation within. As the saying goes, when King Yan wants someone dead at midnight, they will never live until dawn.
The tribulation of a sword cultivator is the same.
It can be seen as a form of punishment from the Heavenly Dao for those who go against the will of heaven and earth.
If given a definition, the Nine Yang Strange Fire and other flames are considered Mortal Fire. Only the tribulation fire belongs to the Heavenly Dao, surpassing all else.
The only way for Chu Feng to pass it safely is one method.
That is to 'unlock'. Attempting to handle it with brute force and violence would be a path to self-destruction.
"Hurrah, hurrah!"
The tribulation fire burned wildly in the depths of Chu Feng's divine soul, the pain spreading like a plague.
